51686830719 has 12 divisors (see below), whose sum is σ = 79050447216. Its totient is φ = 32430952512.

The previous prime is 51686830711. The next prime is 51686830817. The reversal of 51686830719 is 91703868615.

51686830719 is a `hidden beast` number, since 516 + 86 + 8 + 30 + 7 + 19 = 666.

51686830719 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51686830719 - 2³ = 51686830711 is a prime.

It is a super-2 number, since 2×51686830719² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51686830711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168911059 + ... + 168911364.

It is an arithmetic number, because the mean of its divisors is an integer number (6587537268).

Almost surely, 2^51686830719 is an apocalyptic number.

51686830719 is a deficient number, since it is larger than the sum of its proper divisors (27363616497).

51686830719 is a wasteful number, since it uses less digits than its factorization.

51686830719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337822446 (or 337822443 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 51686830719 in words is "fifty-one billion, six hundred eighty-six million, eight hundred thirty thousand, seven hundred nineteen".