55081220931 has 24 divisors (see below), whose sum is σ = 86820254976. Its totient is φ = 33372710640.

The previous prime is 55081220867. The next prime is 55081220959. The reversal of 55081220931 is 13902218055.

55081220931 is a `hidden beast` number, since 550 + 8 + 12 + 2 + 0 + 93 + 1 = 666.

55081220931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55081220931 - 2⁶ = 55081220867 is a prime.

It is a super-2 number, since 2×55081220931² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55081220981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262506 + ... + 423168.

It is an arithmetic number, because the mean of its divisors is an integer number (3617510624).

Almost surely, 2^55081220931 is an apocalyptic number.

55081220931 is a deficient number, since it is larger than the sum of its proper divisors (31739034045).

55081220931 is a wasteful number, since it uses less digits than its factorization.

55081220931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164143 (or 164140 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

Adding to 55081220931 its reverse (13902218055), we get a palindrome (68983438986).

The spelling of 55081220931 in words is "fifty-five billion, eighty-one million, two hundred twenty thousand, nine hundred thirty-one".