51799120781 has 16 divisors (see below), whose sum is σ = 52704220800. Its totient is φ = 50899726080.

The previous prime is 51799120739. The next prime is 51799120799. The reversal of 51799120781 is 18702199715.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51799120781 - 2²⁶ = 51732011917 is a prime.

It is a super-2 number, since 2×51799120781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51799120721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37025120 + ... + 37026518.

It is an arithmetic number, because the mean of its divisors is an integer number (3294013800).

Almost surely, 2^51799120781 is an apocalyptic number.

It is an amenable number.

51799120781 is a deficient number, since it is larger than the sum of its proper divisors (905100019).

51799120781 is a wasteful number, since it uses less digits than its factorization.

51799120781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996.

The product of its (nonzero) digits is 317520, while the sum is 50.

The spelling of 51799120781 in words is "fifty-one billion, seven hundred ninety-nine million, one hundred twenty thousand, seven hundred eighty-one".