55131665 has 16 divisors (see below), whose sum is σ = 69111360. Its totient is φ = 42177600.

The previous prime is 55131647. The next prime is 55131679. The reversal of 55131665 is 56613155.

It is not a de Polignac number, because 55131665 - 2⁸ = 55131409 is a prime.

It is a Curzon number.

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, 8390 + ... + 13440.

It is an arithmetic number, because the mean of its divisors is an integer number (4319460).

Almost surely, 2^55131665 is an apocalyptic number.

It is an amenable number.

55131665 is a deficient number, since it is larger than the sum of its proper divisors (13979695).

55131665 is a wasteful number, since it uses less digits than its factorization.

55131665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152.

The product of its digits is 13500, while the sum is 32.

The square root of 55131665 is about 7425.0700333398. The cubic root of 55131665 is about 380.5984683248.

The spelling of 55131665 in words is "fifty-five million, one hundred thirty-one thousand, six hundred sixty-five".