65715666 has 32 divisors (see below), whose sum is σ = 134217600. Its totient is φ = 21444480.

The previous prime is 65715619. The next prime is 65715673. The reversal of 65715666 is 66651756.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149475 + ... + 149913.

It is an arithmetic number, because the mean of its divisors is an integer number (4194300).

Almost surely, 2^65715666 is an apocalyptic number.

65715666 is an abundant number, since it is smaller than the sum of its proper divisors (68501934).

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

65715666 is a wasteful number, since it uses less digits than its factorization.

65715666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914.

The product of its digits is 226800, while the sum is 42.

The square root of 65715666 is about 8106.5199685192. The cubic root of 65715666 is about 403.5428323711.

The spelling of 65715666 in words is "sixty-five million, seven hundred fifteen thousand, six hundred sixty-six".