51821511996 has 24 divisors (see below), whose sum is σ = 120975531264. Its totient is φ = 17265455920.

The previous prime is 51821511983. The next prime is 51821512027. The reversal of 51821511996 is 69911512815.

It is a happy number.

It is a congruent 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, 1021890 + ... + 1071401.

It is an arithmetic number, because the mean of its divisors is an integer number (5040647136).

Almost surely, 2^51821511996 is an apocalyptic number.

It is an amenable number.

51821511996 is an abundant number, since it is smaller than the sum of its proper divisors (69154019268).

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

51821511996 is a wasteful number, since it uses less digits than its factorization.

51821511996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095361 (or 2095359 counting only the distinct ones).

The product of its digits is 194400, while the sum is 48.

The spelling of 51821511996 in words is "fifty-one billion, eight hundred twenty-one million, five hundred eleven thousand, nine hundred ninety-six".