666001375666 has 16 divisors (see below), whose sum is σ = 1089872169408. Its totient is φ = 302713526800.

The previous prime is 666001375657. The next prime is 666001375667. The reversal of 666001375666 is 666573100666.

It is not an unprimeable number, because it can be changed into a prime (666001375667) 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, 237445 + ... + 1178296.

It is an arithmetic number, because the mean of its divisors is an integer number (68117010588).

Almost surely, 2^666001375666 is an apocalyptic number.

666001375666 is a deficient number, since it is larger than the sum of its proper divisors (423870793742).

666001375666 is a wasteful number, since it uses less digits than its factorization.

666001375666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437137.

The product of its (nonzero) digits is 4898880, while the sum is 52.

The spelling of 666001375666 in words is "six hundred sixty-six billion, one million, three hundred seventy-five thousand, six hundred sixty-six".