5100981994656 has 72 divisors (see below), whose sum is σ = 14548962089844. Its totient is φ = 1695281817600.

The previous prime is 5100981994601. The next prime is 5100981994657. The reversal of 5100981994656 is 6564991890015.

5100981994656 is a `hidden beast` number, since 5 + 1 + 0 + 0 + 9 + 81 + 99 + 465 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4944023402256 + 156958592400 = 2223516^2 + 396180^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 5100981994593 and 5100981994602.

It is not an unprimeable number, because it can be changed into a prime (5100981994657) 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, 26181495 + ... + 26375606.

Almost surely, 2^{5100981994656} is an apocalyptic number.

It is an amenable number.

5100981994656 is an abundant number, since it is smaller than the sum of its proper divisors (9447980095188).

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

5100981994656 is a wasteful number, since it uses less digits than its factorization.

5100981994656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52557454 (or 52557443 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 63.

The spelling of 5100981994656 in words is "five trillion, one hundred billion, nine hundred eighty-one million, nine hundred ninety-four thousand, six hundred fifty-six".