640712733354 has 24 divisors (see below), whose sum is σ = 1389885515460. Its totient is φ = 213313281408.

The previous prime is 640712733337. The next prime is 640712733373. The reversal of 640712733354 is 453337217046.

640712733354 is a `hidden beast` number, since 6 + 40 + 7 + 1 + 273 + 335 + 4 = 666.

640712733354 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 604004089329 + 36708644025 = 777177^2 + 191595^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21453807 + ... + 21483650.

Almost surely, 2^640712733354 is an apocalyptic number.

640712733354 is an abundant number, since it is smaller than the sum of its proper divisors (749172782106).

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

640712733354 is a wasteful number, since it uses less digits than its factorization.

640712733354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42938294 (or 42938291 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 45.

The spelling of 640712733354 in words is "six hundred forty billion, seven hundred twelve million, seven hundred thirty-three thousand, three hundred fifty-four".