66396923 has 2 divisors, whose sum is σ = 66396924. Its totient is φ = 66396922.

The previous prime is 66396919. The next prime is 66396943. The reversal of 66396923 is 32969366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66396923 - 2² = 66396919 is a prime.

It is not a weakly prime, because it can be changed into another prime (66396943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33198461 + 33198462.

It is an arithmetic number, because the mean of its divisors is an integer number (33198462).

Almost surely, 2^66396923 is an apocalyptic number.

66396923 is a deficient number, since it is larger than the sum of its proper divisors (1).

66396923 is an equidigital number, since it uses as much as digits as its factorization.

66396923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 44.

The square root of 66396923 is about 8148.4307078112. The cubic root of 66396923 is about 404.9325153015.

The spelling of 66396923 in words is "sixty-six million, three hundred ninety-six thousand, nine hundred twenty-three".