66395783 has 2 divisors, whose sum is σ = 66395784. Its totient is φ = 66395782.

The previous prime is 66395743. The next prime is 66395789. The reversal of 66395783 is 38759366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66395783 - 2¹⁶ = 66330247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66395789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33197891 + 33197892.

It is an arithmetic number, because the mean of its divisors is an integer number (33197892).

Almost surely, 2^66395783 is an apocalyptic number.

66395783 is a deficient number, since it is larger than the sum of its proper divisors (1).

66395783 is an equidigital number, since it uses as much as digits as its factorization.

66395783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 66395783 is about 8148.3607553912. The cubic root of 66395783 is about 404.9301977959.

The spelling of 66395783 in words is "sixty-six million, three hundred ninety-five thousand, seven hundred eighty-three".