66764271 has 16 divisors (see below), whose sum is σ = 107091200. Its totient is φ = 36142848.

The previous prime is 66764249. The next prime is 66764279. The reversal of 66764271 is 17246766.

It is not a de Polignac number, because 66764271 - 2⁷ = 66764143 is a prime.

It is a super-2 number, since 2×66764271² = 8914935764322882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66764279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83266 + ... + 84063.

It is an arithmetic number, because the mean of its divisors is an integer number (6693200).

Almost surely, 2^66764271 is an apocalyptic number.

66764271 is a deficient number, since it is larger than the sum of its proper divisors (40326929).

66764271 is a wasteful number, since it uses less digits than its factorization.

66764271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167358.

The product of its digits is 84672, while the sum is 39.

The square root of 66764271 is about 8170.9406435245. The cubic root of 66764271 is about 405.6779196358.

The spelling of 66764271 in words is "sixty-six million, seven hundred sixty-four thousand, two hundred seventy-one".