646320263 has 8 divisors (see below), whose sum is σ = 714093408. Its totient is φ = 581853184.

The previous prime is 646320247. The next prime is 646320281. The reversal of 646320263 is 362023646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646320263 - 2⁴ = 646320247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646320163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 826106 + ... + 826887.

It is an arithmetic number, because the mean of its divisors is an integer number (89261676).

Almost surely, 2^646320263 is an apocalyptic number.

646320263 is a deficient number, since it is larger than the sum of its proper divisors (67773145).

646320263 is a wasteful number, since it uses less digits than its factorization.

646320263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653033.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 646320263 is about 25422.8295632095. The cubic root of 646320263 is about 864.6013791402.

The spelling of 646320263 in words is "six hundred forty-six million, three hundred twenty thousand, two hundred sixty-three".