51693930512 has 80 divisors (see below), whose sum is σ = 118788111360. Its totient is φ = 21322689024.

The previous prime is 51693930511. The next prime is 51693930523. The reversal of 51693930512 is 21503939615.

It is not an unprimeable number, because it can be changed into a prime (51693930511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004513 + ... + 1054719.

It is an arithmetic number, because the mean of its divisors is an integer number (1484851392).

Almost surely, 2^51693930512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51693930512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59394055680).

51693930512 is an abundant number, since it is smaller than the sum of its proper divisors (67094180848).

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

51693930512 is a wasteful number, since it uses less digits than its factorization.

51693930512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50568 (or 50562 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 44.

The spelling of 51693930512 in words is "fifty-one billion, six hundred ninety-three million, nine hundred thirty thousand, five hundred twelve".