55165665 has 16 divisors (see below), whose sum is σ = 88358976. Its totient is φ = 29390400.

The previous prime is 55165637. The next prime is 55165681. The reversal of 55165665 is 56656155.

It is not a de Polignac number, because 55165665 - 2⁶ = 55165601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22395 + ... + 24735.

It is an arithmetic number, because the mean of its divisors is an integer number (5522436).

Almost surely, 2^55165665 is an apocalyptic number.

It is an amenable number.

55165665 is a deficient number, since it is larger than the sum of its proper divisors (33193311).

55165665 is a wasteful number, since it uses less digits than its factorization.

55165665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920.

The product of its digits is 135000, while the sum is 39.

The square root of 55165665 is about 7427.3592211499. The cubic root of 55165665 is about 380.6766913007.

The spelling of 55165665 in words is "fifty-five million, one hundred sixty-five thousand, six hundred sixty-five".