55399597720 has 32 divisors (see below), whose sum is σ = 125170660800. Its totient is φ = 22067116288.

The previous prime is 55399597663. The next prime is 55399597733. The reversal of 55399597720 is 2779599355.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2887909 + ... + 2907028.

It is an arithmetic number, because the mean of its divisors is an integer number (3911583150).

Almost surely, 2^55399597720 is an apocalyptic number.

It is an amenable number.

55399597720 is an abundant number, since it is smaller than the sum of its proper divisors (69771063080).

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

55399597720 is a wasteful number, since it uses less digits than its factorization.

55399597720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5795187 (or 5795183 counting only the distinct ones).

The product of its (nonzero) digits is 26790750, while the sum is 61.

The spelling of 55399597720 in words is "fifty-five billion, three hundred ninety-nine million, five hundred ninety-seven thousand, seven hundred twenty".