66697925 has 24 divisors (see below), whose sum is σ = 94952256. Its totient is φ = 45527040.

The previous prime is 66697909. The next prime is 66697937. The reversal of 66697925 is 52979666.

It is not a de Polignac number, because 66697925 - 2⁴ = 66697909 is a prime.

It is a super-2 number, since 2×66697925² = 8897226398611250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44234 + ... + 45716.

It is an arithmetic number, because the mean of its divisors is an integer number (3956344).

Almost surely, 2^66697925 is an apocalyptic number.

It is an amenable number.

66697925 is a deficient number, since it is larger than the sum of its proper divisors (28254331).

66697925 is a wasteful number, since it uses less digits than its factorization.

66697925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757 (or 1752 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 50.

The square root of 66697925 is about 8166.8797591247. The cubic root of 66697925 is about 405.5434963019.

The spelling of 66697925 in words is "sixty-six million, six hundred ninety-seven thousand, nine hundred twenty-five".