55842888721 has 9 divisors (see below), whose sum is σ = 56079964411. Its totient is φ = 55606814032.

The previous prime is 55842888697. The next prime is 55842888769. The reversal of 55842888721 is 12788824855.

The square root of 55842888721 is 236311.

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., 1617246225 + 54225642496 = 40215^2 + 232864^2 .

It is not a de Polignac number, because 55842888721 - 2¹³ = 55842880529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55842888781) 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, 90506805 + ... + 90507421.

Almost surely, 2^55842888721 is an apocalyptic number.

55842888721 is the 236311-st square number.

55842888721 is the 118156-th centered octagonal number.

It is an amenable number.

55842888721 is a deficient number, since it is larger than the sum of its proper divisors (237075690).

55842888721 is an frugal number, since it uses more digits than its factorization.

55842888721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000 (or 1000 counting only the distinct ones).

The product of its digits is 11468800, while the sum is 58.

The spelling of 55842888721 in words is "fifty-five billion, eight hundred forty-two million, eight hundred eighty-eight thousand, seven hundred twenty-one".