640254123604 has 48 divisors (see below), whose sum is σ = 1137362688000. Its totient is φ = 315336309120.

The previous prime is 640254123589. The next prime is 640254123617. The reversal of 640254123604 is 406321452046.

It is a super-2 number, since 2×640254123604² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49931514 + ... + 49944334.

It is an arithmetic number, because the mean of its divisors is an integer number (23695056000).

Almost surely, 2^640254123604 is an apocalyptic number.

It is an amenable number.

640254123604 is a deficient number, since it is larger than the sum of its proper divisors (497108564396).

640254123604 is a wasteful number, since it uses less digits than its factorization.

640254123604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13648 (or 13646 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 640254123604 in words is "six hundred forty billion, two hundred fifty-four million, one hundred twenty-three thousand, six hundred four".