51564437580 has 96 divisors (see below), whose sum is σ = 146266110144. Its totient is φ = 13571702784.

The previous prime is 51564437411. The next prime is 51564437627. The reversal of 51564437580 is 8573446515.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2158984 + ... + 2182736.

It is an arithmetic number, because the mean of its divisors is an integer number (1523605314).

Almost surely, 2^51564437580 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 51564437580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73133055072).

51564437580 is an abundant number, since it is smaller than the sum of its proper divisors (94701672564).

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

51564437580 is a wasteful number, since it uses less digits than its factorization.

51564437580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24235 (or 24233 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 48.

The spelling of 51564437580 in words is "fifty-one billion, five hundred sixty-four million, four hundred thirty-seven thousand, five hundred eighty".