51165644644 has 24 divisors (see below), whose sum is σ = 91086145920. Its totient is φ = 25141304544.

The previous prime is 51165644561. The next prime is 51165644653. The reversal of 51165644644 is 44644656115.

It is a junction number, because it is equal to n+sod(n) for n = 51165644594 and 51165644603.

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, 756522 + ... + 821374.

It is an arithmetic number, because the mean of its divisors is an integer number (3795256080).

Almost surely, 2^51165644644 is an apocalyptic number.

It is an amenable number.

51165644644 is a deficient number, since it is larger than the sum of its proper divisors (39920501276).

51165644644 is a wasteful number, since it uses less digits than its factorization.

51165644644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68259 (or 68257 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 46.

The spelling of 51165644644 in words is "fifty-one billion, one hundred sixty-five million, six hundred forty-four thousand, six hundred forty-four".