51237067136 has 128 divisors (see below), whose sum is σ = 109560729600. Its totient is φ = 23796633600.

The previous prime is 51237067129. The next prime is 51237067157. The reversal of 51237067136 is 63176073215.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 51237067093 and 51237067102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33908621 + ... + 33910131.

It is an arithmetic number, because the mean of its divisors is an integer number (855943200).

Almost surely, 2^51237067136 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 51237067136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54780364800).

51237067136 is an abundant number, since it is smaller than the sum of its proper divisors (58323662464).

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

51237067136 is a wasteful number, since it uses less digits than its factorization.

51237067136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808 (or 1796 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 41.

The spelling of 51237067136 in words is "fifty-one billion, two hundred thirty-seven million, sixty-seven thousand, one hundred thirty-six".