55617615 has 12 divisors (see below), whose sum is σ = 96403944. Its totient is φ = 29662704.

The previous prime is 55617593. The next prime is 55617629. The reversal of 55617615 is 51671655.

It is not a de Polignac number, because 55617615 - 2¹⁸ = 55355471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55617615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 617929 + ... + 618018.

It is an arithmetic number, because the mean of its divisors is an integer number (8033662).

Almost surely, 2^55617615 is an apocalyptic number.

55617615 is a deficient number, since it is larger than the sum of its proper divisors (40786329).

55617615 is a wasteful number, since it uses less digits than its factorization.

55617615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235958 (or 1235955 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 55617615 is about 7457.7218371296. The cubic root of 55617615 is about 381.7134419725.

The spelling of 55617615 in words is "fifty-five million, six hundred seventeen thousand, six hundred fifteen".