66699923 has 8 divisors (see below), whose sum is σ = 68376000. Its totient is φ = 65029608.

The previous prime is 66699847. The next prime is 66699949. The reversal of 66699923 is 32999666.

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

It is a cyclic number.

It is not a de Polignac number, because 66699923 - 2⁸ = 66699667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66699953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30728 + ... + 32826.

It is an arithmetic number, because the mean of its divisors is an integer number (8547000).

Almost surely, 2^66699923 is an apocalyptic number.

66699923 is a deficient number, since it is larger than the sum of its proper divisors (1676077).

66699923 is a wasteful number, since it uses less digits than its factorization.

66699923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881.

The product of its digits is 944784, while the sum is 50.

The square root of 66699923 is about 8167.0020815474. The cubic root of 66699923 is about 405.5475457423.

The spelling of 66699923 in words is "sixty-six million, six hundred ninety-nine thousand, nine hundred twenty-three".