66680994 has 32 divisors (see below), whose sum is σ = 140863680. Its totient is φ = 20984832.

The previous prime is 66680989. The next prime is 66681007. The reversal of 66680994 is 49908666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39414 + ... + 41070.

It is an arithmetic number, because the mean of its divisors is an integer number (4401990).

Almost surely, 2^66680994 is an apocalyptic number.

66680994 is an abundant number, since it is smaller than the sum of its proper divisors (74182686).

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

66680994 is a wasteful number, since it uses less digits than its factorization.

66680994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 66680994 is about 8165.8431285447. The cubic root of 66680994 is about 405.5091782028.

The spelling of 66680994 in words is "sixty-six million, six hundred eighty thousand, nine hundred ninety-four".