51851619524 has 6 divisors (see below), whose sum is σ = 90740334174. Its totient is φ = 25925809760.

The previous prime is 51851619517. The next prime is 51851619541. The reversal of 51851619524 is 42591615815.

It can be written as a sum of positive squares in only one way, i.e., 40622402500 + 11229217024 = 201550^2 + 105968^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6481452437 + ... + 6481452444.

It is an arithmetic number, because the mean of its divisors is an integer number (15123389029).

Almost surely, 2^51851619524 is an apocalyptic number.

It is an amenable number.

51851619524 is a deficient number, since it is larger than the sum of its proper divisors (38888714650).

51851619524 is a wasteful number, since it uses less digits than its factorization.

51851619524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12962904885 (or 12962904883 counting only the distinct ones).

The product of its digits is 432000, while the sum is 47.

The spelling of 51851619524 in words is "fifty-one billion, eight hundred fifty-one million, six hundred nineteen thousand, five hundred twenty-four".