55518117 has 16 divisors (see below), whose sum is σ = 78194688. Its totient is φ = 34982640.

The previous prime is 55518101. The next prime is 55518137. The reversal of 55518117 is 71181555.

It is not a de Polignac number, because 55518117 - 2⁴ = 55518101 is a prime.

It is a super-2 number, since 2×55518117² = 6164522630451378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55518137) 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, 2943 + ... + 10940.

It is an arithmetic number, because the mean of its divisors is an integer number (4887168).

Almost surely, 2^55518117 is an apocalyptic number.

It is an amenable number.

55518117 is a deficient number, since it is larger than the sum of its proper divisors (22676571).

55518117 is a wasteful number, since it uses less digits than its factorization.

55518117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13960.

The product of its digits is 7000, while the sum is 33.

The square root of 55518117 is about 7451.0480470871. The cubic root of 55518117 is about 381.4856820279.

The spelling of 55518117 in words is "fifty-five million, five hundred eighteen thousand, one hundred seventeen".