55817705025021 has 16 divisors (see below), whose sum is σ = 74707162358400. Its totient is φ = 37070027704320.

The previous prime is 55817705025007. The next prime is 55817705025041. The reversal of 55817705025021 is 12052050771855.

It is not a de Polignac number, because 55817705025021 - 2¹⁷ = 55817704893949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55817705025001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167228305 + ... + 167561753.

It is an arithmetic number, because the mean of its divisors is an integer number (4669197647400).

Almost surely, 2^{55817705025021} is an apocalyptic number.

It is an amenable number.

55817705025021 is a deficient number, since it is larger than the sum of its proper divisors (18889457333379).

55817705025021 is a wasteful number, since it uses less digits than its factorization.

55817705025021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545876.

The product of its (nonzero) digits is 980000, while the sum is 48.

Adding to 55817705025021 its reverse (12052050771855), we get a palindrome (67869755796876).

The spelling of 55817705025021 in words is "fifty-five trillion, eight hundred seventeen billion, seven hundred five million, twenty-five thousand, twenty-one".