66775193 has 2 divisors, whose sum is σ = 66775194. Its totient is φ = 66775192.

The previous prime is 66775153. The next prime is 66775199. The reversal of 66775193 is 39157766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64128064 + 2647129 = 8008^2 + 1627^2 .

It is a cyclic number.

It is not a de Polignac number, because 66775193 - 2¹⁸ = 66513049 is a prime.

It is not a weakly prime, because it can be changed into another prime (66775199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387596 + 33387597.

It is an arithmetic number, because the mean of its divisors is an integer number (33387597).

Almost surely, 2^66775193 is an apocalyptic number.

It is an amenable number.

66775193 is a deficient number, since it is larger than the sum of its proper divisors (1).

66775193 is an equidigital number, since it uses as much as digits as its factorization.

66775193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 66775193 is about 8171.6089602966. The cubic root of 66775193 is about 405.7000401132.

The spelling of 66775193 in words is "sixty-six million, seven hundred seventy-five thousand, one hundred ninety-three".