51576902820 has 192 divisors, whose sum is σ = 170509328640. Its totient is φ = 12898400256.

The previous prime is 51576902807. The next prime is 51576902863. The reversal of 51576902820 is 2820967515.

51576902820 is a `hidden beast` number, since 51 + 576 + 9 + 0 + 2 + 8 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2588014 + ... + 2607866.

It is an arithmetic number, because the mean of its divisors is an integer number (888069420).

Almost surely, 2^51576902820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51576902820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85254664320).

51576902820 is an abundant number, since it is smaller than the sum of its proper divisors (118932425820).

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

51576902820 is a wasteful number, since it uses less digits than its factorization.

51576902820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20171 (or 20163 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 51576902820 in words is "fifty-one billion, five hundred seventy-six million, nine hundred two thousand, eight hundred twenty".