666001016605 has 8 divisors (see below), whose sum is σ = 817787295072. Its totient is φ = 520410096528.

The previous prime is 666001016573. The next prime is 666001016621. The reversal of 666001016605 is 506610100666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666001016605 - 2⁵ = 666001016573 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1548839359 + ... + 1548839788.

It is an arithmetic number, because the mean of its divisors is an integer number (102223411884).

Almost surely, 2^666001016605 is an apocalyptic number.

It is an amenable number.

666001016605 is a deficient number, since it is larger than the sum of its proper divisors (151786278467).

666001016605 is a wasteful number, since it uses less digits than its factorization.

666001016605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097679195.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 666001016605 in words is "six hundred sixty-six billion, one million, sixteen thousand, six hundred five".