66699994 has 8 divisors (see below), whose sum is σ = 105315840. Its totient is φ = 31594716.

The previous prime is 66699979. The next prime is 66700001. The reversal of 66699994 is 49999666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877594 + ... + 877669.

It is an arithmetic number, because the mean of its divisors is an integer number (13164480).

Almost surely, 2^66699994 is an apocalyptic number.

66699994 is a deficient number, since it is larger than the sum of its proper divisors (38615846).

66699994 is a wasteful number, since it uses less digits than its factorization.

66699994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755284.

The product of its digits is 5668704, while the sum is 58.

The square root of 66699994 is about 8167.0064283065. The cubic root of 66699994 is about 405.5476896398.

The spelling of 66699994 in words is "sixty-six million, six hundred ninety-nine thousand, nine hundred ninety-four".