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645623605501 = 7214621901169
BaseRepresentation
bin10010110010100100010…
…10100110100011111101
32021201110121201100110221
421121102022212203331
541034214120334001
61212332334301341
764434104046100
oct11312212464375
92251417640427
10645623605501
1122989776a696
12a5162057851
1348b60b10794
1423369682737
1511bda3dd1a1
hex96522a68fd

645623605501 has 12 divisors (see below), whose sum is σ = 751083741180. Its totient is φ = 553353198720.

The previous prime is 645623605483. The next prime is 645623605507. The reversal of 645623605501 is 105506326546.

645623605501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 155966545476 + 489657060025 = 394926^2 + 699755^2 .

It is a de Polignac number, because none of the positive numbers 2k-645623605501 is a prime.

It is a super-2 number, since 2×6456236055012 (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645623605507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265845 + ... + 1167013.

It is an arithmetic number, because the mean of its divisors is an integer number (62590311765).

Almost surely, 2645623605501 is an apocalyptic number.

It is an amenable number.

645623605501 is a deficient number, since it is larger than the sum of its proper divisors (105460135679).

645623605501 is a wasteful number, since it uses less digits than its factorization.

645623605501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915804 (or 915797 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 645623605501 in words is "six hundred forty-five billion, six hundred twenty-three million, six hundred five thousand, five hundred one".

Divisors: 1 7 49 14621 102347 716429 901169 6308183 44157281 13175991949 92231943643 645623605501