55164989917 has 4 divisors (see below), whose sum is σ = 56069334076. Its totient is φ = 54260645760.

The previous prime is 55164989897. The next prime is 55164989921. The reversal of 55164989917 is 71998946155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2490608836 + 52674381081 = 49906^2 + 229509^2 .

It is a cyclic number.

It is not a de Polignac number, because 55164989917 - 2³⁵ = 20805251549 is a prime.

It is a super-2 number, since 2×55164989917² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55164981917) 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, 452171988 + ... + 452172109.

It is an arithmetic number, because the mean of its divisors is an integer number (14017333519).

Almost surely, 2^55164989917 is an apocalyptic number.

It is an amenable number.

55164989917 is a deficient number, since it is larger than the sum of its proper divisors (904344159).

55164989917 is an equidigital number, since it uses as much as digits as its factorization.

55164989917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904344158.

The product of its digits is 24494400, while the sum is 64.

The spelling of 55164989917 in words is "fifty-five billion, one hundred sixty-four million, nine hundred eighty-nine thousand, nine hundred seventeen".