55399518720 has 480 divisors, whose sum is σ = 236149385472. Its totient is φ = 11688247296.

The previous prime is 55399518701. The next prime is 55399518739. The reversal of 55399518720 is 2781599355.

55399518720 is a `hidden beast` number, since 5 + 53 + 9 + 9 + 518 + 72 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (55399518701) and next prime (55399518739).

It is a tau number, because it is divible by the number of its divisors (480).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2083429 + ... + 2109851.

Almost surely, 2^55399518720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55399518720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118074692736).

55399518720 is an abundant number, since it is smaller than the sum of its proper divisors (180749866752).

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

55399518720 is a wasteful number, since it uses less digits than its factorization.

55399518720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26472 (or 26453 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 54.

It can be divided in two parts, 5539 and 9518720, that added together give a palindrome (9524259).

The spelling of 55399518720 in words is "fifty-five billion, three hundred ninety-nine million, five hundred eighteen thousand, seven hundred twenty".