51520320400 has 60 divisors (see below), whose sum is σ = 123799433472. Its totient is φ = 20604488320.

The previous prime is 51520320329. The next prime is 51520320419. The reversal of 51520320400 is 402302515.

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, 4236729 + ... + 4248871.

Almost surely, 2^51520320400 is an apocalyptic number.

51520320400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51520320400 is an abundant number, since it is smaller than the sum of its proper divisors (72279113072).

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

51520320400 is a wasteful number, since it uses less digits than its factorization.

51520320400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22768 (or 22757 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 51520320400 its reverse (402302515), we get a palindrome (51922622915).

The spelling of 51520320400 in words is "fifty-one billion, five hundred twenty million, three hundred twenty thousand, four hundred".