55855868720 has 40 divisors (see below), whose sum is σ = 129997188576. Its totient is φ = 22319587328.

The previous prime is 55855868711. The next prime is 55855868723. The reversal of 55855868720 is 2786855855.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 55855868720.

It is not an unprimeable number, because it can be changed into a prime (55855868723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276497 + ... + 433776.

Almost surely, 2^55855868720 is an apocalyptic number.

It is an amenable number.

55855868720 is an abundant number, since it is smaller than the sum of its proper divisors (74141319856).

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

55855868720 is a wasteful number, since it uses less digits than its factorization.

55855868720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711269 (or 711263 counting only the distinct ones).

The product of its (nonzero) digits is 26880000, while the sum is 59.

The spelling of 55855868720 in words is "fifty-five billion, eight hundred fifty-five million, eight hundred sixty-eight thousand, seven hundred twenty".