51239122536 has 192 divisors, whose sum is σ = 152624465280. Its totient is φ = 14034032640.

The previous prime is 51239122511. The next prime is 51239122549. The reversal of 51239122536 is 63522193215.

It is a junction number, because it is equal to n+sod(n) for n = 51239122494 and 51239122503.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23976060 + ... + 23978196.

It is an arithmetic number, because the mean of its divisors is an integer number (794919090).

Almost surely, 2^51239122536 is an apocalyptic number.

51239122536 is a gapful number since it is divisible by the number (56) 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 51239122536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76312232640).

51239122536 is an abundant number, since it is smaller than the sum of its proper divisors (101385342744).

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

51239122536 is a wasteful number, since it uses less digits than its factorization.

51239122536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312 (or 2249 counting only the distinct ones).

The product of its digits is 97200, while the sum is 39.

The spelling of 51239122536 in words is "fifty-one billion, two hundred thirty-nine million, one hundred twenty-two thousand, five hundred thirty-six".