55613613 has 16 divisors (see below), whose sum is σ = 85651776. Its totient is φ = 31722240.

The previous prime is 55613611. The next prime is 55613617. The reversal of 55613613 is 31631655.

It is not a de Polignac number, because 55613613 - 2¹ = 55613611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55613611) 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, 49006 + ... + 50127.

It is an arithmetic number, because the mean of its divisors is an integer number (5353236).

Almost surely, 2^55613613 is an apocalyptic number.

It is an amenable number.

55613613 is a deficient number, since it is larger than the sum of its proper divisors (30038163).

55613613 is a wasteful number, since it uses less digits than its factorization.

55613613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99164.

The product of its digits is 8100, while the sum is 30.

The square root of 55613613 is about 7457.4535198015. The cubic root of 55613613 is about 381.7042862770.

The spelling of 55613613 in words is "fifty-five million, six hundred thirteen thousand, six hundred thirteen".