55865576881 has 9 divisors (see below), whose sum is σ = 56680524523. Its totient is φ = 55062192640.

The previous prime is 55865576867. The next prime is 55865576903. The reversal of 55865576881 is 18867556855.

The square root of 55865576881 is 236359.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21788416881 + 34077160000 = 147609^2 + 184600^2 .

It is not a de Polignac number, because 55865576881 - 2¹⁵ = 55865544113 is a prime.

It is a super-2 number, since 2×55865576881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55865576831) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16779825 + ... + 16783153.

Almost surely, 2^55865576881 is an apocalyptic number.

55865576881 is the 236359-th square number.

55865576881 is the 118180-th centered octagonal number.

It is an amenable number.

55865576881 is a deficient number, since it is larger than the sum of its proper divisors (814947642).

55865576881 is an frugal number, since it uses more digits than its factorization.

55865576881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800 (or 3400 counting only the distinct ones).

The product of its digits is 80640000, while the sum is 64.

Multiplying 55865576881 by its sum of digits (64), we get a square (3575396920384 = 1890872²).

It can be divided in two parts, 558655 and 76881, that added together give a palindrome (635536).

The spelling of 55865576881 in words is "fifty-five billion, eight hundred sixty-five million, five hundred seventy-six thousand, eight hundred eighty-one".