666763660 has 24 divisors (see below), whose sum is σ = 1400693616. Its totient is φ = 266612160.

The previous prime is 666763609. The next prime is 666763673. The reversal of 666763660 is 66367666.

It is a self number, because there is not a number n which added to its sum of digits gives 666763660.

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, 96894 + ... + 103546.

It is an arithmetic number, because the mean of its divisors is an integer number (58362234).

Almost surely, 2^666763660 is an apocalyptic number.

It is an amenable number.

666763660 is an abundant number, since it is smaller than the sum of its proper divisors (733929956).

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

666763660 is a wasteful number, since it uses less digits than its factorization.

666763660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11673 (or 11671 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 46.

The square root of 666763660 is about 25821.7671742273. The cubic root of 666763660 is about 873.6228284225.

The spelling of 666763660 in words is "six hundred sixty-six million, seven hundred sixty-three thousand, six hundred sixty".