66395983 has 2 divisors, whose sum is σ = 66395984. Its totient is φ = 66395982.

The previous prime is 66395971. The next prime is 66396023. The reversal of 66395983 is 38959366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66395983 - 2⁵ = 66395951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66395783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33197991 + 33197992.

It is an arithmetic number, because the mean of its divisors is an integer number (33197992).

Almost surely, 2^66395983 is an apocalyptic number.

66395983 is a deficient number, since it is larger than the sum of its proper divisors (1).

66395983 is an equidigital number, since it uses as much as digits as its factorization.

66395983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 49.

The square root of 66395983 is about 8148.3730277890. The cubic root of 66395983 is about 404.9306043778.

The spelling of 66395983 in words is "sixty-six million, three hundred ninety-five thousand, nine hundred eighty-three".