51709409268 has 24 divisors (see below), whose sum is σ = 131623951200. Its totient is φ = 15669517920.

The previous prime is 51709409261. The next prime is 51709409287. The reversal of 51709409268 is 86290490715.

It is a self number, because there is not a number n which added to its sum of digits gives 51709409268.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51709409261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195868843 + ... + 195869106.

It is an arithmetic number, because the mean of its divisors is an integer number (5484331300).

Almost surely, 2^51709409268 is an apocalyptic number.

It is an amenable number.

51709409268 is an abundant number, since it is smaller than the sum of its proper divisors (79914541932).

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

51709409268 is a wasteful number, since it uses less digits than its factorization.

51709409268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391737967 (or 391737965 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 51709409268 in words is "fifty-one billion, seven hundred nine million, four hundred nine thousand, two hundred sixty-eight".