66675625 has 10 divisors (see below), whose sum is σ = 83318642. Its totient is φ = 53340000.

The previous prime is 66675613. The next prime is 66675629. The reversal of 66675625 is 52657666.

It can be written as a sum of positive squares in 5 ways, for example, as 47596201 + 19079424 = 6899^2 + 4368^2 .

It is not a de Polignac number, because 66675625 - 2¹¹ = 66673577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66675629) 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, 52716 + ... + 53965.

Almost surely, 2^66675625 is an apocalyptic number.

It is an amenable number.

66675625 is a deficient number, since it is larger than the sum of its proper divisors (16643017).

66675625 is an equidigital number, since it uses as much as digits as its factorization.

66675625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106701 (or 106686 counting only the distinct ones).

The product of its digits is 453600, while the sum is 43.

The square root of 66675625 is about 8165.5143744898. The cubic root of 66675625 is about 405.4982943557.

The spelling of 66675625 in words is "sixty-six million, six hundred seventy-five thousand, six hundred twenty-five".