165115557 has 8 divisors (see below), whose sum is σ = 244615680. Its totient is φ = 110077020.

The previous prime is 165115547. The next prime is 165115583. The reversal of 165115557 is 755511561.

It is a happy number.

It is not a de Polignac number, because 165115557 - 2⁷ = 165115429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165115547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3057669 + ... + 3057722.

It is an arithmetic number, because the mean of its divisors is an integer number (30576960).

Almost surely, 2^165115557 is an apocalyptic number.

It is an amenable number.

165115557 is a deficient number, since it is larger than the sum of its proper divisors (79500123).

165115557 is an equidigital number, since it uses as much as digits as its factorization.

165115557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6115400 (or 6115394 counting only the distinct ones).

The product of its digits is 26250, while the sum is 36.

The square root of 165115557 is about 12849.7298415181. The cubic root of 165115557 is about 548.6086673416.

The spelling of 165115557 in words is "one hundred sixty-five million, one hundred fifteen thousand, five hundred fifty-seven".