51705157680 has 200 divisors, whose sum is σ = 195905367504. Its totient is φ = 12534566400.

The previous prime is 51705157649. The next prime is 51705157697. The reversal of 51705157680 is 8675150715.

51705157680 is a `hidden beast` number, since 5 + 1 + 70 + 5 + 1 + 576 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 291411 + ... + 433970.

Almost surely, 2^51705157680 is an apocalyptic number.

It is an amenable number.

51705157680 is an abundant number, since it is smaller than the sum of its proper divisors (144200209824).

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

51705157680 is a wasteful number, since it uses less digits than its factorization.

51705157680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725417 (or 725402 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 45.

The spelling of 51705157680 in words is "fifty-one billion, seven hundred five million, one hundred fifty-seven thousand, six hundred eighty".