640524104156 has 12 divisors (see below), whose sum is σ = 1157075801280. Its totient is φ = 309931018080.

The previous prime is 640524104081. The next prime is 640524104173. The reversal of 640524104156 is 651401425046.

It is a happy number.

It is a super-2 number, since 2×640524104156² (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 3 ways as a sum of consecutive naturals, for example, 2582758361 + ... + 2582758608.

It is an arithmetic number, because the mean of its divisors is an integer number (96422983440).

Almost surely, 2^640524104156 is an apocalyptic number.

It is an amenable number.

640524104156 is a deficient number, since it is larger than the sum of its proper divisors (516551697124).

640524104156 is a wasteful number, since it uses less digits than its factorization.

640524104156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165517004 (or 5165517002 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 640524104156 in words is "six hundred forty billion, five hundred twenty-four million, one hundred four thousand, one hundred fifty-six".