51512125392 has 320 divisors, whose sum is σ = 184972049920. Its totient is φ = 13362278400.

The previous prime is 51512125387. The next prime is 51512125393. The reversal of 51512125392 is 29352121515.

51512125392 is a `hidden beast` number, since 5 + 1 + 51 + 212 + 5 + 392 = 666.

It is a super-2 number, since 2×51512125392² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51512125393) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2387292 + ... + 2408772.

It is an arithmetic number, because the mean of its divisors is an integer number (578037656).

Almost surely, 2^51512125392 is an apocalyptic number.

51512125392 is a gapful number since it is divisible by the number (52) 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 51512125392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92486024960).

51512125392 is an abundant number, since it is smaller than the sum of its proper divisors (133459924528).

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

51512125392 is a wasteful number, since it uses less digits than its factorization.

51512125392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21579 (or 21567 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 51512125392 in words is "fifty-one billion, five hundred twelve million, one hundred twenty-five thousand, three hundred ninety-two".