66659272 has 8 divisors (see below), whose sum is σ = 124986150. Its totient is φ = 33329632.

The previous prime is 66659249. The next prime is 66659279. The reversal of 66659272 is 27295666.

It can be written as a sum of positive squares in only one way, i.e., 64545156 + 2114116 = 8034^2 + 1454^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (66659279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4166197 + ... + 4166212.

Almost surely, 2^66659272 is an apocalyptic number.

It is an amenable number.

66659272 is a deficient number, since it is larger than the sum of its proper divisors (58326878).

66659272 is a wasteful number, since it uses less digits than its factorization.

66659272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8332415 (or 8332411 counting only the distinct ones).

The product of its digits is 272160, while the sum is 43.

The square root of 66659272 is about 8164.5129677158. The cubic root of 66659272 is about 405.4651405318.

The spelling of 66659272 in words is "sixty-six million, six hundred fifty-nine thousand, two hundred seventy-two".