66712266 has 24 divisors (see below), whose sum is σ = 147272580. Its totient is φ = 21817536.

The previous prime is 66712237. The next prime is 66712273. The reversal of 66712266 is 66221766.

It can be written as a sum of positive squares in 2 ways, for example, as 63920025 + 2792241 = 7995^2 + 1671^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66712266.

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 11 ways as a sum of consecutive naturals, for example, 34011 + ... + 35918.

Almost surely, 2^66712266 is an apocalyptic number.

66712266 is an abundant number, since it is smaller than the sum of its proper divisors (80560314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66712266 is a wasteful number, since it uses less digits than its factorization.

66712266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69990 (or 69987 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 66712266 is about 8167.7577094329. The cubic root of 66712266 is about 405.5725600871.

The spelling of 66712266 in words is "sixty-six million, seven hundred twelve thousand, two hundred sixty-six".