666653701 has 8 divisors (see below), whose sum is σ = 768880640. Its totient is φ = 566174448.

The previous prime is 666653693. The next prime is 666653707. The reversal of 666653701 is 107356666.

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

It is not a de Polignac number, because 666653701 - 2³ = 666653693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666653707) 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, 436101 + ... + 437626.

It is an arithmetic number, because the mean of its divisors is an integer number (96110080).

Almost surely, 2^666653701 is an apocalyptic number.

It is an amenable number.

666653701 is a deficient number, since it is larger than the sum of its proper divisors (102226939).

666653701 is a wasteful number, since it uses less digits than its factorization.

666653701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873843.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 666653701 is about 25819.6378944400. The cubic root of 666653701 is about 873.5748014230.

The spelling of 666653701 in words is "six hundred sixty-six million, six hundred fifty-three thousand, seven hundred one".