51317327655 has 160 divisors (see below), whose sum is σ = 102196987200. Its totient is φ = 24428666880.

The previous prime is 51317327641. The next prime is 51317327671. The reversal of 51317327655 is 55672371315.

51317327655 is a `hidden beast` number, since 5 + 1 + 317 + 327 + 6 + 5 + 5 = 666.

51317327655 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 51317327655 - 2⁶ = 51317327591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51317327655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 64387717 + ... + 64388513.

It is an arithmetic number, because the mean of its divisors is an integer number (638731170).

Almost surely, 2^51317327655 is an apocalyptic number.

51317327655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51317327655 is a deficient number, since it is larger than the sum of its proper divisors (50879659545).

51317327655 is a wasteful number, since it uses less digits than its factorization.

51317327655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071 (or 1062 counting only the distinct ones).

The product of its digits is 661500, while the sum is 45.

The spelling of 51317327655 in words is "fifty-one billion, three hundred seventeen million, three hundred twenty-seven thousand, six hundred fifty-five".