66666666597 has 8 divisors (see below), whose sum is σ = 88983354720. Its totient is φ = 44397211440.

The previous prime is 66666666589. The next prime is 66666666643. The reversal of 66666666597 is 79566666666.

66666666597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 66666666597 - 2³ = 66666666589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666666097) 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, 11804947 + ... + 11810592.

It is an arithmetic number, because the mean of its divisors is an integer number (11122919340).

Almost surely, 2^66666666597 is an apocalyptic number.

It is an amenable number.

66666666597 is a deficient number, since it is larger than the sum of its proper divisors (22316688123).

66666666597 is a wasteful number, since it uses less digits than its factorization.

66666666597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23616483.

The product of its digits is 529079040, while the sum is 69.

Adding to 66666666597 its sum of digits (69), we get a palindrome (66666666666).

It can be divided in two parts, 6666666659 and 7, that added together give a palindrome (6666666666).

The spelling of 66666666597 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred ninety-seven".