1640957168 has 20 divisors (see below), whose sum is σ = 3239344008. Its totient is φ = 804997440.

The previous prime is 1640957159. The next prime is 1640957179. The reversal of 1640957168 is 8617590461.

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, 966698 + ... + 968393.

Almost surely, 2^1640957168 is an apocalyptic number.

It is an amenable number.

1640957168 is a deficient number, since it is larger than the sum of its proper divisors (1598386840).

1640957168 is a wasteful number, since it uses less digits than its factorization.

1640957168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935152 (or 1935146 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1640957168 is about 40508.7295283375. The cubic root of 1640957168 is about 1179.5030867605.

The spelling of 1640957168 in words is "one billion, six hundred forty million, nine hundred fifty-seven thousand, one hundred sixty-eight".