66375975 has 24 divisors (see below), whose sum is σ = 110548480. Its totient is φ = 35140320.

The previous prime is 66375943. The next prime is 66375977. The reversal of 66375975 is 57957366.

It is a happy number.

It is not a de Polignac number, because 66375975 - 2⁵ = 66375943 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66375977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7242 + ... + 13608.

Almost surely, 2^66375975 is an apocalyptic number.

66375975 is a deficient number, since it is larger than the sum of its proper divisors (44172505).

66375975 is a wasteful number, since it uses less digits than its factorization.

66375975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6519 (or 6514 counting only the distinct ones).

The product of its digits is 1190700, while the sum is 48.

The square root of 66375975 is about 8147.1452055306. The cubic root of 66375975 is about 404.8899258853.

The spelling of 66375975 in words is "sixty-six million, three hundred seventy-five thousand, nine hundred seventy-five".