64641263 has 2 divisors, whose sum is σ = 64641264. Its totient is φ = 64641262.

The previous prime is 64641253. The next prime is 64641299. The reversal of 64641263 is 36214646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64641263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64641253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32320631 + 32320632.

It is an arithmetic number, because the mean of its divisors is an integer number (32320632).

Almost surely, 2^64641263 is an apocalyptic number.

64641263 is a deficient number, since it is larger than the sum of its proper divisors (1).

64641263 is an equidigital number, since it uses as much as digits as its factorization.

64641263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 32.

The square root of 64641263 is about 8039.9790422612. The cubic root of 64641263 is about 401.3315272530.

The spelling of 64641263 in words is "sixty-four million, six hundred forty-one thousand, two hundred sixty-three".