51121612520 has 32 divisors (see below), whose sum is σ = 125480322720. Its totient is φ = 18589677120.

The previous prime is 51121612519. The next prime is 51121612523. The reversal of 51121612520 is 2521612115.

It is a super-2 number, since 2×51121612520² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51121612520.

It is not an unprimeable number, because it can be changed into a prime (51121612523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58092302 + ... + 58093181.

It is an arithmetic number, because the mean of its divisors is an integer number (3921260085).

Almost surely, 2^51121612520 is an apocalyptic number.

It is an amenable number.

51121612520 is an abundant number, since it is smaller than the sum of its proper divisors (74358710200).

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

51121612520 is a wasteful number, since it uses less digits than its factorization.

51121612520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116185505 (or 116185501 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The spelling of 51121612520 in words is "fifty-one billion, one hundred twenty-one million, six hundred twelve thousand, five hundred twenty".