55123398720 has 224 divisors, whose sum is σ = 209422227840. Its totient is φ = 13568808960.

The previous prime is 55123398697. The next prime is 55123398749. The reversal of 55123398720 is 2789332155.

55123398720 is a `hidden beast` number, since 5 + 512 + 3 + 39 + 87 + 20 = 666.

It is a super-3 number, since 3×55123398720³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133066 + ... + 357705.

It is an arithmetic number, because the mean of its divisors is an integer number (934920660).

Almost surely, 2^55123398720 is an apocalyptic number.

It is an amenable number.

55123398720 is an abundant number, since it is smaller than the sum of its proper divisors (154298829120).

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

55123398720 is a wasteful number, since it uses less digits than its factorization.

55123398720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490810 (or 490794 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 55123398720 in words is "fifty-five billion, one hundred twenty-three million, three hundred ninety-eight thousand, seven hundred twenty".