55556645440 has 28 divisors (see below), whose sum is σ = 132294262716. Its totient is φ = 22222658048.

The previous prime is 55556645437. The next prime is 55556645461. The reversal of 55556645440 is 4454665555.

55556645440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7830126144 + 47726519296 = 88488^2 + 218464^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86806939 + ... + 86807578.

It is an arithmetic number, because the mean of its divisors is an integer number (4724795097).

Almost surely, 2^55556645440 is an apocalyptic number.

It is an amenable number.

55556645440 is an abundant number, since it is smaller than the sum of its proper divisors (76737617276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55556645440 is a wasteful number, since it uses less digits than its factorization.

55556645440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173614534 (or 173614524 counting only the distinct ones).

The product of its (nonzero) digits is 7200000, while the sum is 49.

The spelling of 55556645440 in words is "fifty-five billion, five hundred fifty-six million, six hundred forty-five thousand, four hundred forty".