65966191 has 2 divisors, whose sum is σ = 65966192. Its totient is φ = 65966190.

The previous prime is 65966183. The next prime is 65966207. The reversal of 65966191 is 19166956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65966191 - 2³ = 65966183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65966101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32983095 + 32983096.

It is an arithmetic number, because the mean of its divisors is an integer number (32983096).

Almost surely, 2^65966191 is an apocalyptic number.

65966191 is a deficient number, since it is larger than the sum of its proper divisors (1).

65966191 is an equidigital number, since it uses as much as digits as its factorization.

65966191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 43.

The square root of 65966191 is about 8121.9573379820. The cubic root of 65966191 is about 404.0549850822.

The spelling of 65966191 in words is "sixty-five million, nine hundred sixty-six thousand, one hundred ninety-one".