66694967 has 4 divisors (see below), whose sum is σ = 66960936. Its totient is φ = 66429000.

The previous prime is 66694951. The next prime is 66695017. The reversal of 66694967 is 76949666.

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

It is a cyclic number.

It is not a de Polignac number, because 66694967 - 2⁴ = 66694951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66693967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132608 + ... + 133109.

It is an arithmetic number, because the mean of its divisors is an integer number (16740234).

Almost surely, 2^66694967 is an apocalyptic number.

66694967 is a deficient number, since it is larger than the sum of its proper divisors (265969).

66694967 is a wasteful number, since it uses less digits than its factorization.

66694967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265968.

The product of its digits is 2939328, while the sum is 53.

The square root of 66694967 is about 8166.6986598013. The cubic root of 66694967 is about 405.5375010360.

The spelling of 66694967 in words is "sixty-six million, six hundred ninety-four thousand, nine hundred sixty-seven".