666666666597 has 8 divisors (see below), whose sum is σ = 889201558944. Its totient is φ = 444288109328.

The previous prime is 666666666553. The next prime is 666666666599. The reversal of 666666666597 is 795666666666.

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 666666666597 - 2³¹ = 664519182949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666666599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39073818 + ... + 39090875.

It is an arithmetic number, because the mean of its divisors is an integer number (111150194868).

Almost surely, 2^666666666597 is an apocalyptic number.

It is an amenable number.

666666666597 is a deficient number, since it is larger than the sum of its proper divisors (222534892347).

666666666597 is a wasteful number, since it uses less digits than its factorization.

666666666597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78167539.

The product of its digits is 3174474240, while the sum is 75.

It can be divided in two parts, 66666666659 and 7, that added together give a palindrome (66666666666).

The spelling of 666666666597 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred ninety-seven".