51564200072 has 64 divisors (see below), whose sum is σ = 120579027840. Its totient is φ = 20083392000.

The previous prime is 51564200057. The next prime is 51564200081. The reversal of 51564200072 is 27000246515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2154572 + ... + 2178372.

It is an arithmetic number, because the mean of its divisors is an integer number (1884047310).

Almost surely, 2^51564200072 is an apocalyptic number.

It is an amenable number.

51564200072 is an abundant number, since it is smaller than the sum of its proper divisors (69014827768).

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

51564200072 is a wasteful number, since it uses less digits than its factorization.

51564200072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27342 (or 27338 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

Adding to 51564200072 its reverse (27000246515), we get a palindrome (78564446587).

The spelling of 51564200072 in words is "fifty-one billion, five hundred sixty-four million, two hundred thousand, seventy-two".