55918760391 has 18 divisors (see below), whose sum is σ = 87462678888. Its totient is φ = 34411543920.

The previous prime is 55918760383. The next prime is 55918760423. The reversal of 55918760391 is 19306781955.

55918760391 is a `hidden beast` number, since 559 + 1 + 87 + 6 + 0 + 3 + 9 + 1 = 666.

It is not a de Polignac number, because 55918760391 - 2³ = 55918760383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55918760351) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18380715 + ... + 18383756.

It is an arithmetic number, because the mean of its divisors is an integer number (4859037716).

Almost surely, 2^55918760391 is an apocalyptic number.

55918760391 is a deficient number, since it is larger than the sum of its proper divisors (31543918497).

55918760391 is a wasteful number, since it uses less digits than its factorization.

55918760391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36764503 (or 36764487 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 55918760391 in words is "fifty-five billion, nine hundred eighteen million, seven hundred sixty thousand, three hundred ninety-one".