66618466 has 8 divisors (see below), whose sum is σ = 101566044. Its totient is φ = 32763120.

The previous prime is 66618457. The next prime is 66618467. The reversal of 66618466 is 66481666.

It can be written as a sum of positive squares in 2 ways, for example, as 39879225 + 26739241 = 6315^2 + 5171^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66618467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272905 + ... + 273148.

Almost surely, 2^66618466 is an apocalyptic number.

66618466 is a deficient number, since it is larger than the sum of its proper divisors (34947578).

66618466 is a wasteful number, since it uses less digits than its factorization.

66618466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546116.

The product of its digits is 248832, while the sum is 43.

The square root of 66618466 is about 8162.0135995966. The cubic root of 66618466 is about 405.3823874138.

The spelling of 66618466 in words is "sixty-six million, six hundred eighteen thousand, four hundred sixty-six".