64664591 has 2 divisors, whose sum is σ = 64664592. Its totient is φ = 64664590.

The previous prime is 64664573. The next prime is 64664609. The reversal of 64664591 is 19546646.

It is a balanced prime because it is at equal distance from previous prime (64664573) and next prime (64664609).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64664591 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64664191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32332295 + 32332296.

It is an arithmetic number, because the mean of its divisors is an integer number (32332296).

Almost surely, 2^64664591 is an apocalyptic number.

64664591 is a deficient number, since it is larger than the sum of its proper divisors (1).

64664591 is an equidigital number, since it uses as much as digits as its factorization.

64664591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 64664591 is about 8041.4296614470. The cubic root of 64664591 is about 401.3797994940.

The spelling of 64664591 in words is "sixty-four million, six hundred sixty-four thousand, five hundred ninety-one".