66239923 has 2 divisors, whose sum is σ = 66239924. Its totient is φ = 66239922.

The previous prime is 66239917. The next prime is 66239989. The reversal of 66239923 is 32993266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66239923 - 2⁵ = 66239891 is a prime.

It is not a weakly prime, because it can be changed into another prime (66239903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33119961 + 33119962.

It is an arithmetic number, because the mean of its divisors is an integer number (33119962).

Almost surely, 2^66239923 is an apocalyptic number.

66239923 is a deficient number, since it is larger than the sum of its proper divisors (1).

66239923 is an equidigital number, since it uses as much as digits as its factorization.

66239923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 40.

The square root of 66239923 is about 8138.7912493195. The cubic root of 66239923 is about 404.6131000002.

The spelling of 66239923 in words is "sixty-six million, two hundred thirty-nine thousand, nine hundred twenty-three".