66395994 has 32 divisors (see below), whose sum is σ = 159751680. Its totient is φ = 17971632.

The previous prime is 66395983. The next prime is 66396023. The reversal of 66395994 is 49959366.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 40804 + ... + 42399.

It is an arithmetic number, because the mean of its divisors is an integer number (4992240).

Almost surely, 2^66395994 is an apocalyptic number.

66395994 is an abundant number, since it is smaller than the sum of its proper divisors (93355686).

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

66395994 is a wasteful number, since it uses less digits than its factorization.

66395994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83234.

The product of its digits is 1574640, while the sum is 51.

The square root of 66395994 is about 8148.3737027704. The cubic root of 66395994 is about 404.9306267398.

The spelling of 66395994 in words is "sixty-six million, three hundred ninety-five thousand, nine hundred ninety-four".