666317679 has 16 divisors (see below), whose sum is σ = 900894720. Its totient is φ = 437991840.

The previous prime is 666317677. The next prime is 666317693. The reversal of 666317679 is 976713666.

It is not a de Polignac number, because 666317679 - 2¹ = 666317677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666317677) 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, 233449 + ... + 236285.

It is an arithmetic number, because the mean of its divisors is an integer number (56305920).

Almost surely, 2^666317679 is an apocalyptic number.

666317679 is a deficient number, since it is larger than the sum of its proper divisors (234577041).

666317679 is a wasteful number, since it uses less digits than its factorization.

666317679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910.

The product of its digits is 1714608, while the sum is 51.

The square root of 666317679 is about 25813.1299729421. The cubic root of 666317679 is about 873.4280037257.

It can be divided in two parts, 6663 and 17679, that added together give a palindrome (24342).

The spelling of 666317679 in words is "six hundred sixty-six million, three hundred seventeen thousand, six hundred seventy-nine".