666733764 has 12 divisors (see below), whose sum is σ = 1555712144. Its totient is φ = 222244584.

The previous prime is 666733763. The next prime is 666733777. The reversal of 666733764 is 467337666.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (666733763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27780562 + ... + 27780585.

Almost surely, 2^666733764 is an apocalyptic number.

It is an amenable number.

666733764 is an abundant number, since it is smaller than the sum of its proper divisors (888978380).

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

666733764 is a wasteful number, since it uses less digits than its factorization.

666733764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55561154 (or 55561152 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 48.

The square root of 666733764 is about 25821.1882762974. The cubic root of 666733764 is about 873.6097712129.

The spelling of 666733764 in words is "six hundred sixty-six million, seven hundred thirty-three thousand, seven hundred sixty-four".