66393963 has 12 divisors (see below), whose sum is σ = 99209760. Its totient is φ = 42736176.

The previous prime is 66393937. The next prime is 66393979. The reversal of 66393963 is 36939366.

66393963 is a `hidden beast` number, since 6 + 639 + 3 + 9 + 6 + 3 = 666.

It is not a de Polignac number, because 66393963 - 2⁵ = 66393931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66393913) by changing a digit.

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, 126931 + ... + 127452.

It is an arithmetic number, because the mean of its divisors is an integer number (8267480).

Almost surely, 2^66393963 is an apocalyptic number.

66393963 is a deficient number, since it is larger than the sum of its proper divisors (32815797).

66393963 is a wasteful number, since it uses less digits than its factorization.

66393963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254418 (or 254415 counting only the distinct ones).

The product of its digits is 472392, while the sum is 45.

The square root of 66393963 is about 8148.2490757217. The cubic root of 66393963 is about 404.9264978637.

The spelling of 66393963 in words is "sixty-six million, three hundred ninety-three thousand, nine hundred sixty-three".