645136624211600 has 120 divisors (see below), whose sum is σ = 1551223072843080. Its totient is φ = 257841231298560.

The previous prime is 645136624211581. The next prime is 645136624211603. The reversal of 645136624211600 is 6112426631546.

It can be written as a sum of positive squares in 12 ways, for example, as 639990423073024 + 5146201138576 = 25298032^2 + 2268524^2 .

It is not an unprimeable number, because it can be changed into a prime (645136624211603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2589859856 + ... + 2590108944.

It is an arithmetic number, because the mean of its divisors is an integer number (12926858940359).

Almost surely, 2^{645136624211600} is an apocalyptic number.

It is an amenable number.

645136624211600 is an abundant number, since it is smaller than the sum of its proper divisors (906086448631480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645136624211600 is a wasteful number, since it uses less digits than its factorization.

645136624211600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254437 (or 254426 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 645136624211600 in words is "six hundred forty-five trillion, one hundred thirty-six billion, six hundred twenty-four million, two hundred eleven thousand, six hundred".