645615441355 has 8 divisors (see below), whose sum is σ = 774743342112. Its totient is φ = 516489144768.

The previous prime is 645615441353. The next prime is 645615441379. The reversal of 645615441355 is 553144516546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645615441355 - 2¹ = 645615441353 is a prime.

It is a super-2 number, since 2×645615441355² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645615441299 and 645615441308.

It is not an unprimeable number, because it can be changed into a prime (645615441353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 825279 + ... + 1404391.

It is an arithmetic number, because the mean of its divisors is an integer number (96842917764).

Almost surely, 2^645615441355 is an apocalyptic number.

645615441355 is a deficient number, since it is larger than the sum of its proper divisors (129127900757).

645615441355 is a wasteful number, since it uses less digits than its factorization.

645615441355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802085.

The product of its digits is 4320000, while the sum is 49.

The spelling of 645615441355 in words is "six hundred forty-five billion, six hundred fifteen million, four hundred forty-one thousand, three hundred fifty-five".