51608248765 has 32 divisors (see below), whose sum is σ = 65304079200. Its totient is φ = 39095992320.

The previous prime is 51608248739. The next prime is 51608248787. The reversal of 51608248765 is 56784280615.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 14754232089 + 36854016676 = 121467^2 + 191974^2 .

It is not a de Polignac number, because 51608248765 - 2²¹ = 51606151613 is a prime.

It is a super-2 number, since 2×51608248765² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3114021 + ... + 3130549.

It is an arithmetic number, because the mean of its divisors is an integer number (2040752475).

Almost surely, 2^51608248765 is an apocalyptic number.

It is an amenable number.

51608248765 is a deficient number, since it is larger than the sum of its proper divisors (13695830435).

51608248765 is a wasteful number, since it uses less digits than its factorization.

51608248765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16977.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 51608248765 in words is "fifty-one billion, six hundred eight million, two hundred forty-eight thousand, seven hundred sixty-five".