55312122400 has 72 divisors (see below), whose sum is σ = 137319492240. Its totient is φ = 21749832960.

The previous prime is 55312122377. The next prime is 55312122427. The reversal of 55312122400 is 422121355.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 538734 + ... + 633133.

It is an arithmetic number, because the mean of its divisors is an integer number (1907215170).

Almost surely, 2^55312122400 is an apocalyptic number.

55312122400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55312122400 is an abundant number, since it is smaller than the sum of its proper divisors (82007369840).

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

55312122400 is a wasteful number, since it uses less digits than its factorization.

55312122400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171946 (or 1171933 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 55312122400 its reverse (422121355), we get a palindrome (55734243755).

The spelling of 55312122400 in words is "fifty-five billion, three hundred twelve million, one hundred twenty-two thousand, four hundred".