55688665 has 4 divisors (see below), whose sum is σ = 66826404. Its totient is φ = 44550928.

The previous prime is 55688657. The next prime is 55688683. The reversal of 55688665 is 56688655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18429849 + 37258816 = 4293^2 + 6104^2 .

It is a cyclic number.

It is not a de Polignac number, because 55688665 - 2³ = 55688657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5568862 + ... + 5568871.

It is an arithmetic number, because the mean of its divisors is an integer number (16706601).

Almost surely, 2^55688665 is an apocalyptic number.

It is an amenable number.

55688665 is a deficient number, since it is larger than the sum of its proper divisors (11137739).

55688665 is a wasteful number, since it uses less digits than its factorization.

55688665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137738.

The product of its digits is 1728000, while the sum is 49.

The square root of 55688665 is about 7462.4838358284. The cubic root of 55688665 is about 381.8759156754.

The spelling of 55688665 in words is "fifty-five million, six hundred eighty-eight thousand, six hundred sixty-five".