66949566 has 8 divisors (see below), whose sum is σ = 133899144. Its totient is φ = 22316520.

The previous prime is 66949537. The next prime is 66949591. The reversal of 66949566 is 66594966.

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

66949566 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5579125 + ... + 5579136.

It is an arithmetic number, because the mean of its divisors is an integer number (16737393).

Almost surely, 2^66949566 is an apocalyptic number.

66949566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66949566 is a wasteful number, since it uses less digits than its factorization.

66949566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11158266.

The product of its digits is 2099520, while the sum is 51.

The square root of 66949566 is about 8182.2714450206. The cubic root of 66949566 is about 406.0528739570.

The spelling of 66949566 in words is "sixty-six million, nine hundred forty-nine thousand, five hundred sixty-six".