66699272 has 32 divisors (see below), whose sum is σ = 132645600. Its totient is φ = 31353984.

The previous prime is 66699263. The next prime is 66699293. The reversal of 66699272 is 27299666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19223 + ... + 22425.

It is an arithmetic number, because the mean of its divisors is an integer number (4145175).

Almost surely, 2^66699272 is an apocalyptic number.

It is an amenable number.

66699272 is a deficient number, since it is larger than the sum of its proper divisors (65946328).

66699272 is a wasteful number, since it uses less digits than its factorization.

66699272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3365 (or 3361 counting only the distinct ones).

The product of its digits is 489888, while the sum is 47.

The square root of 66699272 is about 8166.9622259442. The cubic root of 66699272 is about 405.5462263389.

The spelling of 66699272 in words is "sixty-six million, six hundred ninety-nine thousand, two hundred seventy-two".