165240557 has 8 divisors (see below), whose sum is σ = 169967616. Its totient is φ = 160527312.

The previous prime is 165240539. The next prime is 165240577. The reversal of 165240557 is 755042561.

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

It is not a de Polignac number, because 165240557 - 2²⁰ = 164191981 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 (165240577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23828 + ... + 29970.

It is an arithmetic number, because the mean of its divisors is an integer number (21245952).

Almost surely, 2^165240557 is an apocalyptic number.

It is an amenable number.

165240557 is a deficient number, since it is larger than the sum of its proper divisors (4727059).

165240557 is an equidigital number, since it uses as much as digits as its factorization.

165240557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6907.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 165240557 is about 12854.5928368035. The cubic root of 165240557 is about 548.7470730070.

The spelling of 165240557 in words is "one hundred sixty-five million, two hundred forty thousand, five hundred fifty-seven".