51120520000 has 280 divisors, whose sum is σ = 139172850432. Its totient is φ = 18470400000.

The previous prime is 51120519997. The next prime is 51120520001. The reversal of 51120520000 is 2502115.

It is a super-2 number, since 2×51120520000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51120520001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 98119740 + ... + 98120260.

Almost surely, 2^51120520000 is an apocalyptic number.

51120520000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51120520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69586425216).

51120520000 is an abundant number, since it is smaller than the sum of its proper divisors (88052330432).

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

51120520000 is a wasteful number, since it uses less digits than its factorization.

51120520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The spelling of 51120520000 in words is "fifty-one billion, one hundred twenty million, five hundred twenty thousand".