66378994 has 16 divisors (see below), whose sum is σ = 109195776. Its totient is φ = 30012400.

The previous prime is 66378937. The next prime is 66379003. The reversal of 66378994 is 49987366.

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 7 ways as a sum of consecutive naturals, for example, 3697 + ... + 12100.

It is an arithmetic number, because the mean of its divisors is an integer number (6824736).

Almost surely, 2^66378994 is an apocalyptic number.

66378994 is a deficient number, since it is larger than the sum of its proper divisors (42816782).

66378994 is a wasteful number, since it uses less digits than its factorization.

66378994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16001.

The product of its digits is 1959552, while the sum is 52.

The square root of 66378994 is about 8147.3304830478. The cubic root of 66378994 is about 404.8960643722.

The spelling of 66378994 in words is "sixty-six million, three hundred seventy-eight thousand, nine hundred ninety-four".