51610665 has 16 divisors (see below), whose sum is σ = 82937088. Its totient is φ = 27405696.

The previous prime is 51610661. The next prime is 51610667. The reversal of 51610665 is 56601615.

It is not a de Polignac number, because 51610665 - 2² = 51610661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51610661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3889 + ... + 10878.

It is an arithmetic number, because the mean of its divisors is an integer number (5183568).

Almost surely, 2^51610665 is an apocalyptic number.

It is an amenable number.

51610665 is a deficient number, since it is larger than the sum of its proper divisors (31326423).

51610665 is a wasteful number, since it uses less digits than its factorization.

51610665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15008.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 51610665 is about 7184.0563054586. The cubic root of 51610665 is about 372.3172444053.

The spelling of 51610665 in words is "fifty-one million, six hundred ten thousand, six hundred sixty-five".