51867793988 has 6 divisors (see below), whose sum is σ = 90768639486. Its totient is φ = 25933896992.

The previous prime is 51867793987. The next prime is 51867794059. The reversal of 51867793988 is 88939776815.

It can be written as a sum of positive squares in only one way, i.e., 37860598084 + 14007195904 = 194578^2 + 118352^2 .

It is not an unprimeable number, because it can be changed into a prime (51867793987) by changing a digit.

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 as a sum of consecutive naturals, namely, 6483474245 + ... + 6483474252.

It is an arithmetic number, because the mean of its divisors is an integer number (15128106581).

Almost surely, 2^51867793988 is an apocalyptic number.

It is an amenable number.

51867793988 is a deficient number, since it is larger than the sum of its proper divisors (38900845498).

51867793988 is a wasteful number, since it uses less digits than its factorization.

51867793988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12966948501 (or 12966948499 counting only the distinct ones).

The product of its digits is 182891520, while the sum is 71.

The spelling of 51867793988 in words is "fifty-one billion, eight hundred sixty-seven million, seven hundred ninety-three thousand, nine hundred eighty-eight".