666464656 has 40 divisors (see below), whose sum is σ = 1517027904. Its totient is φ = 279634560.

The previous prime is 666464641. The next prime is 666464657. The reversal of 666464656 is 656464666.

666464656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (666464657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143356 + ... + 147931.

Almost surely, 2^666464656 is an apocalyptic number.

It is an amenable number.

666464656 is an abundant number, since it is smaller than the sum of its proper divisors (850563248).

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

666464656 is a wasteful number, since it uses less digits than its factorization.

666464656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291319 (or 291313 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 49.

The square root of 666464656 is about 25815.9767585889. The cubic root of 666464656 is about 873.4922195364.

The spelling of 666464656 in words is "six hundred sixty-six million, four hundred sixty-four thousand, six hundred fifty-six".