51566516 has 24 divisors (see below), whose sum is σ = 93811200. Its totient is φ = 24775200.

The previous prime is 51566507. The next prime is 51566521. The reversal of 51566516 is 61566515.

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, 17081 + ... + 19871.

It is an arithmetic number, because the mean of its divisors is an integer number (3908800).

Almost surely, 2^51566516 is an apocalyptic number.

It is an amenable number.

51566516 is a deficient number, since it is larger than the sum of its proper divisors (42244684).

51566516 is a wasteful number, since it uses less digits than its factorization.

51566516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2975 (or 2973 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

The square root of 51566516 is about 7180.9829410743. The cubic root of 51566516 is about 372.2110510876.

Subtracting 51566516 from its reverse (61566515), we obtain a palindrome (9999999).

The spelling of 51566516 in words is "fifty-one million, five hundred sixty-six thousand, five hundred sixteen".