51643578764 has 24 divisors (see below), whose sum is σ = 90776322000. Its totient is φ = 25707665984.

The previous prime is 51643578743. The next prime is 51643578787. The reversal of 51643578764 is 46787534615.

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, 1165487 + ... + 1208985.

It is an arithmetic number, because the mean of its divisors is an integer number (3782346750).

Almost surely, 2^51643578764 is an apocalyptic number.

It is an amenable number.

51643578764 is a deficient number, since it is larger than the sum of its proper divisors (39132743236).

51643578764 is a wasteful number, since it uses less digits than its factorization.

51643578764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44809 (or 44807 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 56.

The spelling of 51643578764 in words is "fifty-one billion, six hundred forty-three million, five hundred seventy-eight thousand, seven hundred sixty-four".