165520668 has 24 divisors (see below), whose sum is σ = 386425872. Its totient is φ = 55143424.

The previous prime is 165520657. The next prime is 165520697. The reversal of 165520668 is 866025561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35446 + ... + 39842.

It is an arithmetic number, because the mean of its divisors is an integer number (16101078).

Almost surely, 2^165520668 is an apocalyptic number.

It is an amenable number.

165520668 is an abundant number, since it is smaller than the sum of its proper divisors (220905204).

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

165520668 is a wasteful number, since it uses less digits than its factorization.

165520668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7541 (or 7539 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 165520668 is about 12865.4835898228. The cubic root of 165520668 is about 549.0569713373.

The spelling of 165520668 in words is "one hundred sixty-five million, five hundred twenty thousand, six hundred sixty-eight".