165555057 has 32 divisors (see below), whose sum is σ = 233304192. Its totient is φ = 104315904.

The previous prime is 165555043. The next prime is 165555067. The reversal of 165555057 is 750555561.

It is not a de Polignac number, because 165555057 - 2¹⁶ = 165489521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165555017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 840283 + ... + 840479.

It is an arithmetic number, because the mean of its divisors is an integer number (7290756).

Almost surely, 2^165555057 is an apocalyptic number.

It is an amenable number.

165555057 is a deficient number, since it is larger than the sum of its proper divisors (67749135).

165555057 is a wasteful number, since it uses less digits than its factorization.

165555057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417.

The product of its (nonzero) digits is 131250, while the sum is 39.

The square root of 165555057 is about 12866.8200034041. The cubic root of 165555057 is about 549.0949932007.

It can be divided in two parts, 16555 and 5057, that added together give a palindrome (21612).

The spelling of 165555057 in words is "one hundred sixty-five million, five hundred fifty-five thousand, fifty-seven".