666693601 has 8 divisors (see below), whose sum is σ = 762689984. Its totient is φ = 570885840.

The previous prime is 666693563. The next prime is 666693611. The reversal of 666693601 is 106396666.

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

It is not a de Polignac number, because 666693601 - 2⁷ = 666693473 is a prime.

It is a super-2 number, since 2×666693601² = 888960715228694402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666693611) 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, 39495 + ... + 53788.

It is an arithmetic number, because the mean of its divisors is an integer number (95336248).

Almost surely, 2^666693601 is an apocalyptic number.

It is an amenable number.

666693601 is a deficient number, since it is larger than the sum of its proper divisors (95996383).

666693601 is a wasteful number, since it uses less digits than its factorization.

666693601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94311.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 666693601 is about 25820.4105505703. The cubic root of 666693601 is about 873.5922292316.

The spelling of 666693601 in words is "six hundred sixty-six million, six hundred ninety-three thousand, six hundred one".