51636312420 has 192 divisors, whose sum is σ = 180564443136. Its totient is φ = 10711365120.

The previous prime is 51636312389. The next prime is 51636312451. The reversal of 51636312420 is 2421363615.

It is an interprime number because it is at equal distance from previous prime (51636312389) and next prime (51636312451).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2795134 + ... + 2813546.

It is an arithmetic number, because the mean of its divisors is an integer number (940439808).

Almost surely, 2^51636312420 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 51636312420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90282221568).

51636312420 is an abundant number, since it is smaller than the sum of its proper divisors (128928130716).

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

51636312420 is a wasteful number, since it uses less digits than its factorization.

51636312420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19050 (or 19048 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 51636312420 in words is "fifty-one billion, six hundred thirty-six million, three hundred twelve thousand, four hundred twenty".