66393966 has 24 divisors (see below), whose sum is σ = 134509032. Its totient is φ = 21846000.

The previous prime is 66393937. The next prime is 66393979. The reversal of 66393966 is 66939366.

It is a congruent number.

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, 200421 + ... + 200751.

It is an arithmetic number, because the mean of its divisors is an integer number (5604543).

Almost surely, 2^66393966 is an apocalyptic number.

66393966 is an abundant number, since it is smaller than the sum of its proper divisors (68115066).

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

66393966 is a wasteful number, since it uses less digits than its factorization.

66393966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 437 counting only the distinct ones).

The product of its digits is 944784, while the sum is 48.

The square root of 66393966 is about 8148.2492598104. The cubic root of 66393966 is about 404.9265039625.

The spelling of 66393966 in words is "sixty-six million, three hundred ninety-three thousand, nine hundred sixty-six".