666666700040 has 64 divisors (see below), whose sum is σ = 1680589805760. Its totient is φ = 235872241920.

The previous prime is 666666700033. The next prime is 666666700067. The reversal of 666666700040 is 40007666666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20458742 + ... + 20491301.

It is an arithmetic number, because the mean of its divisors is an integer number (26259215715).

Almost surely, 2^666666700040 is an apocalyptic number.

It is an amenable number.

666666700040 is an abundant number, since it is smaller than the sum of its proper divisors (1013923105720).

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

666666700040 is a wasteful number, since it uses less digits than its factorization.

666666700040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40950102 (or 40950098 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 47.

The spelling of 666666700040 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred thousand, forty".