66831875 has 20 divisors (see below), whose sum is σ = 91114584. Its totient is φ = 48600000.

The previous prime is 66831857. The next prime is 66831881. The reversal of 66831875 is 57813866.

It is not a de Polignac number, because 66831875 - 2¹² = 66827779 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, 2015 + ... + 11735.

Almost surely, 2^66831875 is an apocalyptic number.

66831875 is a deficient number, since it is larger than the sum of its proper divisors (24282709).

66831875 is an equidigital number, since it uses as much as digits as its factorization.

66831875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9752 (or 9737 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 66831875 is about 8175.0764522419. The cubic root of 66831875 is about 405.8148002261.

Subtracting from 66831875 its reverse (57813866), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 6683 and 1875, that added together give a palindrome (8558).

The spelling of 66831875 in words is "sixty-six million, eight hundred thirty-one thousand, eight hundred seventy-five".