64641583 has 2 divisors, whose sum is σ = 64641584. Its totient is φ = 64641582.

The previous prime is 64641581. The next prime is 64641587. The reversal of 64641583 is 38514646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64641583 - 2¹ = 64641581 is a prime.

Together with 64641581, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64641581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32320791 + 32320792.

It is an arithmetic number, because the mean of its divisors is an integer number (32320792).

Almost surely, 2^64641583 is an apocalyptic number.

64641583 is a deficient number, since it is larger than the sum of its proper divisors (1).

64641583 is an equidigital number, since it uses as much as digits as its factorization.

64641583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 37.

The square root of 64641583 is about 8039.9989427860. The cubic root of 64641583 is about 401.3321895023.

The spelling of 64641583 in words is "sixty-four million, six hundred forty-one thousand, five hundred eighty-three".