66666675 has 24 divisors (see below), whose sum is σ = 111875776. Its totient is φ = 35022240.

The previous prime is 66666667. The next prime is 66666683. The reversal of 66666675 is 57666666.

It is an interprime number because it is at equal distance from previous prime (66666667) and next prime (66666683).

It is not a de Polignac number, because 66666675 - 2³ = 66666667 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1609 + ... + 11658.

Almost surely, 2^66666675 is an apocalyptic number.

66666675 is a deficient number, since it is larger than the sum of its proper divisors (45209101).

66666675 is a wasteful number, since it uses less digits than its factorization.

66666675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13347 (or 13342 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 48.

The square root of 66666675 is about 8164.9663195876. The cubic root of 66666675 is about 405.4801499332.

Subtracting from 66666675 its reverse (57666666), we obtain a palindrome (9000009).

The spelling of 66666675 in words is "sixty-six million, six hundred sixty-six thousand, six hundred seventy-five".