55918419657 has 4 divisors (see below), whose sum is σ = 74557892880. Its totient is φ = 37278946436.

The previous prime is 55918419653. The next prime is 55918419673. The reversal of 55918419657 is 75691481955.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55918419657 - 2² = 55918419653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55918419657.

It is not an unprimeable number, because it can be changed into a prime (55918419653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9319736607 + ... + 9319736612.

It is an arithmetic number, because the mean of its divisors is an integer number (18639473220).

Almost surely, 2^55918419657 is an apocalyptic number.

It is an amenable number.

55918419657 is a deficient number, since it is larger than the sum of its proper divisors (18639473223).

55918419657 is a wasteful number, since it uses less digits than its factorization.

55918419657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18639473222.

The product of its digits is 13608000, while the sum is 60.

It can be divided in two parts, 5591 and 8419657, that added together give a palindrome (8425248).

The spelling of 55918419657 in words is "fifty-five billion, nine hundred eighteen million, four hundred nineteen thousand, six hundred fifty-seven".