51857766945 has 40 divisors (see below), whose sum is σ = 97852487040. Its totient is φ = 26201815200.

The previous prime is 51857766817. The next prime is 51857766973. The reversal of 51857766945 is 54966775815.

51857766945 is a `hidden beast` number, since 5 + 18 + 577 + 6 + 6 + 9 + 45 = 666.

It is not a de Polignac number, because 51857766945 - 2⁷ = 51857766817 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3361881 + ... + 3377270.

It is an arithmetic number, because the mean of its divisors is an integer number (2446312176).

Almost surely, 2^51857766945 is an apocalyptic number.

It is an amenable number.

51857766945 is a deficient number, since it is larger than the sum of its proper divisors (45994720095).

51857766945 is a wasteful number, since it uses less digits than its factorization.

51857766945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6739187 (or 6739178 counting only the distinct ones).

The product of its digits is 63504000, while the sum is 63.

The spelling of 51857766945 in words is "fifty-one billion, eight hundred fifty-seven million, seven hundred sixty-six thousand, nine hundred forty-five".