51231563736 has 64 divisors (see below), whose sum is σ = 128948949120. Its totient is φ = 16961322240.

The previous prime is 51231563717. The next prime is 51231563741. The reversal of 51231563736 is 63736513215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7793331 + ... + 7799901.

It is an arithmetic number, because the mean of its divisors is an integer number (2014827330).

Almost surely, 2^51231563736 is an apocalyptic number.

It is an amenable number.

51231563736 is an abundant number, since it is smaller than the sum of its proper divisors (77717385384).

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

51231563736 is a wasteful number, since it uses less digits than its factorization.

51231563736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8736 (or 8732 counting only the distinct ones).

The product of its digits is 340200, while the sum is 42.

The spelling of 51231563736 in words is "fifty-one billion, two hundred thirty-one million, five hundred sixty-three thousand, seven hundred thirty-six".