646441363 has 2 divisors, whose sum is σ = 646441364. Its totient is φ = 646441362.

The previous prime is 646441361. The next prime is 646441379. The reversal of 646441363 is 363144646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646441363 - 2¹ = 646441361 is a prime.

Together with 646441361, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (646441361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323220681 + 323220682.

It is an arithmetic number, because the mean of its divisors is an integer number (323220682).

Almost surely, 2^646441363 is an apocalyptic number.

646441363 is a deficient number, since it is larger than the sum of its proper divisors (1).

646441363 is an equidigital number, since it uses as much as digits as its factorization.

646441363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 37.

The square root of 646441363 is about 25425.2111692312. The cubic root of 646441363 is about 864.6553754298.

The spelling of 646441363 in words is "six hundred forty-six million, four hundred forty-one thousand, three hundred sixty-three".