66651272 has 8 divisors (see below), whose sum is σ = 124971150. Its totient is φ = 33325632.

The previous prime is 66651253. The next prime is 66651283. The reversal of 66651272 is 27215666.

It can be written as a sum of positive squares in only one way, i.e., 65383396 + 1267876 = 8086^2 + 1126^2 .

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

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 as a sum of consecutive naturals, namely, 4165697 + ... + 4165712.

Almost surely, 2^66651272 is an apocalyptic number.

It is an amenable number.

66651272 is a deficient number, since it is larger than the sum of its proper divisors (58319878).

66651272 is a wasteful number, since it uses less digits than its factorization.

66651272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331415 (or 8331411 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 66651272 is about 8164.0230278950. The cubic root of 66651272 is about 405.4489194781.

The spelling of 66651272 in words is "sixty-six million, six hundred fifty-one thousand, two hundred seventy-two".