640858353408 has 216 divisors, whose sum is σ = 2274157817568. Its totient is φ = 169017532416.

The previous prime is 640858353407. The next prime is 640858353439. The reversal of 640858353408 is 804353858046.

640858353408 is a `hidden beast` number, since 6 + 4 + 0 + 8 + 583 + 53 + 4 + 0 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640858353407) 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, 1318635 + ... + 1737962.

Almost surely, 2^640858353408 is an apocalyptic number.

It is an amenable number.

640858353408 is an abundant number, since it is smaller than the sum of its proper divisors (1633299464160).

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

640858353408 is a wasteful number, since it uses less digits than its factorization.

640858353408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056639 (or 3056622 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 54.

The spelling of 640858353408 in words is "six hundred forty billion, eight hundred fifty-eight million, three hundred fifty-three thousand, four hundred eight".