51644276920 has 16 divisors (see below), whose sum is σ = 116199623160. Its totient is φ = 20657710752.

The previous prime is 51644276839. The next prime is 51644276963. The reversal of 51644276920 is 2967244615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645553422 + ... + 645553501.

Almost surely, 2^51644276920 is an apocalyptic number.

It is an amenable number.

51644276920 is an abundant number, since it is smaller than the sum of its proper divisors (64555346240).

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

51644276920 is a wasteful number, since it uses less digits than its factorization.

51644276920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291106934 (or 1291106930 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 51644276920 in words is "fifty-one billion, six hundred forty-four million, two hundred seventy-six thousand, nine hundred twenty".