165515656 has 8 divisors (see below), whose sum is σ = 310341870. Its totient is φ = 82757824.

The previous prime is 165515641. The next prime is 165515677. The reversal of 165515656 is 656515561.

It can be written as a sum of positive squares in only one way, i.e., 126202756 + 39312900 = 11234^2 + 6270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×165515656² = 54790864762220672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344721 + ... + 10344736.

Almost surely, 2^165515656 is an apocalyptic number.

It is an amenable number.

165515656 is a deficient number, since it is larger than the sum of its proper divisors (144826214).

165515656 is a wasteful number, since it uses less digits than its factorization.

165515656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20689463 (or 20689459 counting only the distinct ones).

The product of its digits is 135000, while the sum is 40.

The square root of 165515656 is about 12865.2888035986. The cubic root of 165515656 is about 549.0514294285.

The spelling of 165515656 in words is "one hundred sixty-five million, five hundred fifteen thousand, six hundred fifty-six".