66631875 has 20 divisors (see below), whose sum is σ = 111020712. Its totient is φ = 35536000.

The previous prime is 66631849. The next prime is 66631889. The reversal of 66631875 is 57813666.

It is not a de Polignac number, because 66631875 - 2⁵ = 66631843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15894 + ... + 19643.

Almost surely, 2^66631875 is an apocalyptic number.

66631875 is a deficient number, since it is larger than the sum of its proper divisors (44388837).

66631875 is an equidigital number, since it uses as much as digits as its factorization.

66631875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35560 (or 35545 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 66631875 is about 8162.8349854692. The cubic root of 66631875 is about 405.4095841161.

The spelling of 66631875 in words is "sixty-six million, six hundred thirty-one thousand, eight hundred seventy-five".