55417917918 has 48 divisors (see below), whose sum is σ = 127610591616. Its totient is φ = 15909443280.

The previous prime is 55417917911. The next prime is 55417917949. The reversal of 55417917918 is 81971971455.

It is a super-2 number, since 2×55417917918² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55417917911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1139146 + ... + 1186797.

It is an arithmetic number, because the mean of its divisors is an integer number (2658553992).

Almost surely, 2^55417917918 is an apocalyptic number.

55417917918 is an abundant number, since it is smaller than the sum of its proper divisors (72192673698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55417917918 is a wasteful number, since it uses less digits than its factorization.

55417917918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325997 (or 2325978 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 57.

The spelling of 55417917918 in words is "fifty-five billion, four hundred seventeen million, nine hundred seventeen thousand, nine hundred eighteen".