65665625166 has 24 divisors (see below), whose sum is σ = 145584255960. Its totient is φ = 21379505616.

The previous prime is 65665625149. The next prime is 65665625171. The reversal of 65665625166 is 66152656656.

65665625166 is a `hidden beast` number, since 6 + 5 + 6 + 6 + 5 + 625 + 1 + 6 + 6 = 666.

It is a super-2 number, since 2×65665625166² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

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, 42418881 + ... + 42420428.

It is an arithmetic number, because the mean of its divisors is an integer number (6066010665).

Almost surely, 2^65665625166 is an apocalyptic number.

65665625166 is an abundant number, since it is smaller than the sum of its proper divisors (79918630794).

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

65665625166 is a wasteful number, since it uses less digits than its factorization.

65665625166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84839360 (or 84839357 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 54.

The spelling of 65665625166 in words is "sixty-five billion, six hundred sixty-five million, six hundred twenty-five thousand, one hundred sixty-six".