51020685810 has 96 divisors (see below), whose sum is σ = 137629844352. Its totient is φ = 13599290880.

The previous prime is 51020685809. The next prime is 51020685817. The reversal of 51020685810 is 1858602015.

51020685810 is a `hidden beast` number, since 5 + 10 + 2 + 0 + 68 + 581 + 0 = 666.

51020685810 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51020685810² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51020685817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8164107 + ... + 8170353.

It is an arithmetic number, because the mean of its divisors is an integer number (1433644212).

Almost surely, 2^51020685810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51020685810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68814922176).

51020685810 is an abundant number, since it is smaller than the sum of its proper divisors (86609158542).

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

51020685810 is a wasteful number, since it uses less digits than its factorization.

51020685810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9630 (or 9618 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 51020685810 in words is "fifty-one billion, twenty million, six hundred eighty-five thousand, eight hundred ten".