66765516 has 24 divisors (see below), whose sum is σ = 156399600. Its totient is φ = 22167552.

The previous prime is 66765493. The next prime is 66765533. The reversal of 66765516 is 61556766.

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, 7741 + ... + 13908.

It is an arithmetic number, because the mean of its divisors is an integer number (6516650).

Almost surely, 2^66765516 is an apocalyptic number.

It is an amenable number.

66765516 is an abundant number, since it is smaller than the sum of its proper divisors (89634084).

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

66765516 is a wasteful number, since it uses less digits than its factorization.

66765516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21913 (or 21911 counting only the distinct ones).

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

The square root of 66765516 is about 8171.0168277883. The cubic root of 66765516 is about 405.6804412733.

The spelling of 66765516 in words is "sixty-six million, seven hundred sixty-five thousand, five hundred sixteen".