68640165 has 48 divisors (see below), whose sum is σ = 135457920. Its totient is φ = 31827840.

The previous prime is 68640157. The next prime is 68640193. The reversal of 68640165 is 56104686.

68640165 is a `hidden beast` number, since 6 + 8 + 640 + 1 + 6 + 5 = 666.

It is not a de Polignac number, because 68640165 - 2³ = 68640157 is a prime.

It is a super-2 number, since 2×68640165² = 9422944502454450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8371 + ... + 14399.

It is an arithmetic number, because the mean of its divisors is an integer number (2822040).

Almost surely, 2^68640165 is an apocalyptic number.

It is an amenable number.

68640165 is a deficient number, since it is larger than the sum of its proper divisors (66817755).

68640165 is a wasteful number, since it uses less digits than its factorization.

68640165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6074 (or 6071 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 68640165 is about 8284.9360287210. The cubic root of 68640165 is about 409.4423610771.

The spelling of 68640165 in words is "sixty-eight million, six hundred forty thousand, one hundred sixty-five".