51891488419815 has 96 divisors (see below), whose sum is σ = 100778172019200. Its totient is φ = 24478517986560.

The previous prime is 51891488419801. The next prime is 51891488419817.

51891488419815 is a `hidden beast` number, since 5 + 1 + 8 + 9 + 1 + 488 + 41 + 98 + 15 = 666.

51891488419815 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51891488419815 - 2¹¹ = 51891488417767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51891488419817) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 636204006 + ... + 636285564.

It is an arithmetic number, because the mean of its divisors is an integer number (1049772625200).

Almost surely, 2^{51891488419815} is an apocalyptic number.

51891488419815 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51891488419815 is a deficient number, since it is larger than the sum of its proper divisors (48886683599385).

51891488419815 is a wasteful number, since it uses less digits than its factorization.

51891488419815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116357 (or 116354 counting only the distinct ones).

The product of its digits is 132710400, while the sum is 72.

The spelling of 51891488419815 in words is "fifty-one trillion, eight hundred ninety-one billion, four hundred eighty-eight million, four hundred nineteen thousand, eight hundred fifteen".