51820666788 has 24 divisors (see below), whose sum is σ = 131907152160. Its totient is φ = 15703232320.

The previous prime is 51820666769. The next prime is 51820666817. The reversal of 51820666788 is 88766602815.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196290273 + ... + 196290536.

It is an arithmetic number, because the mean of its divisors is an integer number (5496131340).

Almost surely, 2^51820666788 is an apocalyptic number.

It is an amenable number.

51820666788 is an abundant number, since it is smaller than the sum of its proper divisors (80086485372).

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

51820666788 is a wasteful number, since it uses less digits than its factorization.

51820666788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392580827 (or 392580825 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 51820666788 in words is "fifty-one billion, eight hundred twenty million, six hundred sixty-six thousand, seven hundred eighty-eight".