640125245656 has 16 divisors (see below), whose sum is σ = 1292560592400. Its totient is φ = 295442421024.

The previous prime is 640125245653. The next prime is 640125245737. The reversal of 640125245656 is 656542521046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640125245653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3077525116 + ... + 3077525323.

It is an arithmetic number, because the mean of its divisors is an integer number (80785037025).

Almost surely, 2^640125245656 is an apocalyptic number.

It is an amenable number.

640125245656 is an abundant number, since it is smaller than the sum of its proper divisors (652435346744).

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

640125245656 is a wasteful number, since it uses less digits than its factorization.

640125245656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6155050458 (or 6155050454 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 640125245656 in words is "six hundred forty billion, one hundred twenty-five million, two hundred forty-five thousand, six hundred fifty-six".