66320923 has 4 divisors (see below), whose sum is σ = 66410928. Its totient is φ = 66230920.

The previous prime is 66320911. The next prime is 66320959. The reversal of 66320923 is 32902366.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66320923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66320123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43888 + ... + 45373.

It is an arithmetic number, because the mean of its divisors is an integer number (16602732).

Almost surely, 2^66320923 is an apocalyptic number.

66320923 is a deficient number, since it is larger than the sum of its proper divisors (90005).

66320923 is an equidigital number, since it uses as much as digits as its factorization.

66320923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90004.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 66320923 is about 8143.7658979123. The cubic root of 66320923 is about 404.7779568310. Note that the first 3 decimals are identical.

The spelling of 66320923 in words is "sixty-six million, three hundred twenty thousand, nine hundred twenty-three".