646289263 has 2 divisors, whose sum is σ = 646289264. Its totient is φ = 646289262.

The previous prime is 646289243. The next prime is 646289291. The reversal of 646289263 is 362982646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646289263 - 2²¹ = 644192111 is a prime.

It is a super-2 number, since 2×646289263² = 835379622938166338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646289243) 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, 323144631 + 323144632.

It is an arithmetic number, because the mean of its divisors is an integer number (323144632).

Almost surely, 2^646289263 is an apocalyptic number.

646289263 is a deficient number, since it is larger than the sum of its proper divisors (1).

646289263 is an equidigital number, since it uses as much as digits as its factorization.

646289263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 46.

The square root of 646289263 is about 25422.2198676669. The cubic root of 646289263 is about 864.5875557192.

The spelling of 646289263 in words is "six hundred forty-six million, two hundred eighty-nine thousand, two hundred sixty-three".