51566216144 has 60 divisors (see below), whose sum is σ = 111647540484. Its totient is φ = 22989229056.

The previous prime is 51566216101. The next prime is 51566216189. The reversal of 51566216144 is 44161266515.

It can be written as a sum of positive squares in 2 ways, for example, as 27575923600 + 23990292544 = 166060^2 + 154888^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164387 + ... + 360770.

Almost surely, 2^51566216144 is an apocalyptic number.

It is an amenable number.

51566216144 is an abundant number, since it is smaller than the sum of its proper divisors (60081324340).

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

51566216144 is a wasteful number, since it uses less digits than its factorization.

51566216144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525220 (or 525195 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The spelling of 51566216144 in words is "fifty-one billion, five hundred sixty-six million, two hundred sixteen thousand, one hundred forty-four".