51019949717568 has 168 divisors, whose sum is σ = 157492783401408. Its totient is φ = 15698035473408.

The previous prime is 51019949717497. The next prime is 51019949717591. The reversal of 51019949717568 is 86571794991015.

51019949717568 is a `hidden beast` number, since 5 + 1 + 0 + 1 + 9 + 9 + 49 + 7 + 17 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 51019949717496 and 51019949717505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 415874605 + ... + 415997267.

It is an arithmetic number, because the mean of its divisors is an integer number (937457044056).

Almost surely, 2^{51019949717568} is an apocalyptic number.

It is an amenable number.

51019949717568 is an abundant number, since it is smaller than the sum of its proper divisors (106472833683840).

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

51019949717568 is a wasteful number, since it uses less digits than its factorization.

51019949717568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178241 (or 178228 counting only the distinct ones).

The product of its (nonzero) digits is 171460800, while the sum is 72.

The spelling of 51019949717568 in words is "fifty-one trillion, nineteen billion, nine hundred forty-nine million, seven hundred seventeen thousand, five hundred sixty-eight".