51501222400 has 60 divisors (see below), whose sum is σ = 127598333742. Its totient is φ = 20600483840.

The previous prime is 51501222391. The next prime is 51501222401. The reversal of 51501222400 is 422210515.

51501222400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 41465991424 + 10035230976 = 203632^2 + 100176^2 .

It is not an unprimeable number, because it can be changed into a prime (51501222401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1998967 + ... + 2024566.

Almost surely, 2^51501222400 is an apocalyptic number.

51501222400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51501222400 is an abundant number, since it is smaller than the sum of its proper divisors (76097111342).

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

51501222400 is an equidigital number, since it uses as much as digits as its factorization.

51501222400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023561 (or 4023540 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 51501222400 its reverse (422210515), we get a palindrome (51923432915).

The spelling of 51501222400 in words is "fifty-one billion, five hundred one million, two hundred twenty-two thousand, four hundred".