165055557 has 8 divisors (see below), whose sum is σ = 226022176. Its totient is φ = 107062992.

The previous prime is 165055549. The next prime is 165055571. The reversal of 165055557 is 755550561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165055557 - 2³ = 165055549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165055537) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 743383 + ... + 743604.

It is an arithmetic number, because the mean of its divisors is an integer number (28252772).

Almost surely, 2^165055557 is an apocalyptic number.

It is an amenable number.

165055557 is a deficient number, since it is larger than the sum of its proper divisors (60966619).

165055557 is a wasteful number, since it uses less digits than its factorization.

165055557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487027.

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

The square root of 165055557 is about 12847.3949499500. The cubic root of 165055557 is about 548.5422078096.

The spelling of 165055557 in words is "one hundred sixty-five million, fifty-five thousand, five hundred fifty-seven".