66395867 has 2 divisors, whose sum is σ = 66395868. Its totient is φ = 66395866.

The previous prime is 66395839. The next prime is 66395881. The reversal of 66395867 is 76859366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66395867 is a prime.

It is a super-2 number, since 2×66395867² = 8816822309363378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66395807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33197933 + 33197934.

It is an arithmetic number, because the mean of its divisors is an integer number (33197934).

Almost surely, 2^66395867 is an apocalyptic number.

66395867 is a deficient number, since it is larger than the sum of its proper divisors (1).

66395867 is an equidigital number, since it uses as much as digits as its factorization.

66395867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 66395867 is about 8148.3659098006. The cubic root of 66395867 is about 404.9303685604.

The spelling of 66395867 in words is "sixty-six million, three hundred ninety-five thousand, eight hundred sixty-seven".