666704693 has 16 divisors (see below), whose sum is σ = 721766400. Its totient is φ = 614355840.

The previous prime is 666704681. The next prime is 666704747. The reversal of 666704693 is 396407666.

It is a cyclic number.

It is not a de Polignac number, because 666704693 - 2¹⁶ = 666639157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666704603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60548 + ... + 70706.

It is an arithmetic number, because the mean of its divisors is an integer number (45110400).

Almost surely, 2^666704693 is an apocalyptic number.

It is an amenable number.

666704693 is a deficient number, since it is larger than the sum of its proper divisors (55061707).

666704693 is a wasteful number, since it uses less digits than its factorization.

666704693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10292.

The product of its (nonzero) digits is 979776, while the sum is 47.

The square root of 666704693 is about 25820.6253409944. The cubic root of 666704693 is about 873.5970739515.

The spelling of 666704693 in words is "six hundred sixty-six million, seven hundred four thousand, six hundred ninety-three".