645301844101 has 2 divisors, whose sum is σ = 645301844102. Its totient is φ = 645301844100.

The previous prime is 645301844087. The next prime is 645301844111. The reversal of 645301844101 is 101448103546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 584169776100 + 61132068001 = 764310^2 + 247249^2 .

It is a cyclic number.

It is not a de Polignac number, because 645301844101 - 2⁷ = 645301843973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645301844111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322650922050 + 322650922051.

It is an arithmetic number, because the mean of its divisors is an integer number (322650922051).

Almost surely, 2^645301844101 is an apocalyptic number.

It is an amenable number.

645301844101 is a deficient number, since it is larger than the sum of its proper divisors (1).

645301844101 is an equidigital number, since it uses as much as digits as its factorization.

645301844101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 37.

Adding to 645301844101 its reverse (101448103546), we get a palindrome (746749947647).

The spelling of 645301844101 in words is "six hundred forty-five billion, three hundred one million, eight hundred forty-four thousand, one hundred one".