66940694 has 4 divisors (see below), whose sum is σ = 100411044. Its totient is φ = 33470346.

The previous prime is 66940639. The next prime is 66940703. The reversal of 66940694 is 49604966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16735172 + ... + 16735175.

It is an arithmetic number, because the mean of its divisors is an integer number (25102761).

Almost surely, 2^66940694 is an apocalyptic number.

66940694 is a deficient number, since it is larger than the sum of its proper divisors (33470350).

66940694 is a wasteful number, since it uses less digits than its factorization.

66940694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33470349.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 66940694 is about 8181.7292793150. The cubic root of 66940694 is about 406.0349367721.

The spelling of 66940694 in words is "sixty-six million, nine hundred forty thousand, six hundred ninety-four".