64650191 has 2 divisors, whose sum is σ = 64650192. Its totient is φ = 64650190.

The previous prime is 64650169. The next prime is 64650227. The reversal of 64650191 is 19105646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64650191 - 2¹⁸ = 64388047 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 (64650101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32325095 + 32325096.

It is an arithmetic number, because the mean of its divisors is an integer number (32325096).

Almost surely, 2^64650191 is an apocalyptic number.

64650191 is a deficient number, since it is larger than the sum of its proper divisors (1).

64650191 is an equidigital number, since it uses as much as digits as its factorization.

64650191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 64650191 is about 8040.5342484191. The cubic root of 64650191 is about 401.3500031860.

The spelling of 64650191 in words is "sixty-four million, six hundred fifty thousand, one hundred ninety-one".