51611656 has 16 divisors (see below), whose sum is σ = 96876540. Its totient is φ = 25777920.

The previous prime is 51611647. The next prime is 51611669. The reversal of 51611656 is 65611615.

It can be written as a sum of positive squares in 2 ways, for example, as 51351556 + 260100 = 7166^2 + 510^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5836 + ... + 11716.

Almost surely, 2^51611656 is an apocalyptic number.

It is an amenable number.

51611656 is a deficient number, since it is larger than the sum of its proper divisors (45264884).

51611656 is a wasteful number, since it uses less digits than its factorization.

51611656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6984 (or 6980 counting only the distinct ones).

The product of its digits is 5400, while the sum is 31.

The square root of 51611656 is about 7184.1252773041. The cubic root of 51611656 is about 372.3196274013.

The spelling of 51611656 in words is "fifty-one million, six hundred eleven thousand, six hundred fifty-six".