66967866 has 48 divisors (see below), whose sum is σ = 166330944. Its totient is φ = 19075392.

The previous prime is 66967829. The next prime is 66967871. The reversal of 66967866 is 66876966.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57001 + ... + 58163.

It is an arithmetic number, because the mean of its divisors is an integer number (3465228).

Almost surely, 2^66967866 is an apocalyptic number.

66967866 is an abundant number, since it is smaller than the sum of its proper divisors (99363078).

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

66967866 is a wasteful number, since it uses less digits than its factorization.

66967866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1632 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 66967866 is about 8183.3896399964. The cubic root of 66967866 is about 406.0898674289.

The spelling of 66967866 in words is "sixty-six million, nine hundred sixty-seven thousand, eight hundred sixty-six".