165055556 has 6 divisors (see below), whose sum is σ = 288847230. Its totient is φ = 82527776.

The previous prime is 165055549. The next prime is 165055571. The reversal of 165055556 is 655550561.

It can be written as a sum of positive squares in only one way, i.e., 135722500 + 29333056 = 11650^2 + 5416^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20631941 + ... + 20631948.

It is an arithmetic number, because the mean of its divisors is an integer number (48141205).

Almost surely, 2^165055556 is an apocalyptic number.

It is an amenable number.

165055556 is a deficient number, since it is larger than the sum of its proper divisors (123791674).

165055556 is a wasteful number, since it uses less digits than its factorization.

165055556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41263893 (or 41263891 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 165055556 is about 12847.3949110316. The cubic root of 165055556 is about 548.5422067018.

The spelling of 165055556 in words is "one hundred sixty-five million, fifty-five thousand, five hundred fifty-six".