55551165 has 16 divisors (see below), whose sum is σ = 89399808. Its totient is φ = 29454656.

The previous prime is 55551157. The next prime is 55551169. The reversal of 55551165 is 56115555.

It is a cyclic number.

It is not a de Polignac number, because 55551165 - 2³ = 55551157 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8109 + ... + 13298.

It is an arithmetic number, because the mean of its divisors is an integer number (5587488).

Almost surely, 2^55551165 is an apocalyptic number.

It is an amenable number.

55551165 is a deficient number, since it is larger than the sum of its proper divisors (33848643).

55551165 is a wasteful number, since it uses less digits than its factorization.

55551165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21588.

The product of its digits is 18750, while the sum is 33.

The square root of 55551165 is about 7453.2653917595. The cubic root of 55551165 is about 381.5613620567.

The spelling of 55551165 in words is "fifty-five million, five hundred fifty-one thousand, one hundred sixty-five".