64640063 has 2 divisors, whose sum is σ = 64640064. Its totient is φ = 64640062.

The previous prime is 64640057. The next prime is 64640083. The reversal of 64640063 is 36004646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64640063 - 2¹⁴ = 64623679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64640003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32320031 + 32320032.

It is an arithmetic number, because the mean of its divisors is an integer number (32320032).

Almost surely, 2^64640063 is an apocalyptic number.

64640063 is a deficient number, since it is larger than the sum of its proper divisors (1).

64640063 is an equidigital number, since it uses as much as digits as its factorization.

64640063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 64640063 is about 8039.9044148547. The cubic root of 64640063 is about 401.3290437990.

The spelling of 64640063 in words is "sixty-four million, six hundred forty thousand, sixty-three".