66636875 has 10 divisors (see below), whose sum is σ = 83270220. Its totient is φ = 53309000.

The previous prime is 66636863. The next prime is 66636877. The reversal of 66636875 is 57863666.

It is a happy number.

It is not a de Polignac number, because 66636875 - 2⁶ = 66636811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66636877) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 52685 + ... + 53934.

It is an arithmetic number, because the mean of its divisors is an integer number (8327022).

Almost surely, 2^66636875 is an apocalyptic number.

66636875 is a deficient number, since it is larger than the sum of its proper divisors (16633345).

66636875 is an equidigital number, since it uses as much as digits as its factorization.

66636875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106639 (or 106624 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 47.

The square root of 66636875 is about 8163.1412458685. The cubic root of 66636875 is about 405.4197243941.

The spelling of 66636875 in words is "sixty-six million, six hundred thirty-six thousand, eight hundred seventy-five".