55115865581 has 8 divisors (see below), whose sum is σ = 65161614720. Its totient is φ = 45613129968.

The previous prime is 55115865547. The next prime is 55115865583. The reversal of 55115865581 is 18556851155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55115865581 - 2¹⁸ = 55115603437 is a prime.

It is a super-2 number, since 2×55115865581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55115865583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135753161 + ... + 135753566.

It is an arithmetic number, because the mean of its divisors is an integer number (8145201840).

Almost surely, 2^55115865581 is an apocalyptic number.

It is an amenable number.

55115865581 is a deficient number, since it is larger than the sum of its proper divisors (10045749139).

55115865581 is a wasteful number, since it uses less digits than its factorization.

55115865581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271506763.

The product of its digits is 1200000, while the sum is 50.

The spelling of 55115865581 in words is "fifty-five billion, one hundred fifteen million, eight hundred sixty-five thousand, five hundred eighty-one".