6445866263 has 4 divisors (see below), whose sum is σ = 6446057760. Its totient is φ = 6445674768.

The previous prime is 6445866241. The next prime is 6445866341. The reversal of 6445866263 is 3626685446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6445866263 - 2⁶ = 6445866199 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 (6445866463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30383 + ... + 117536.

It is an arithmetic number, because the mean of its divisors is an integer number (1611514440).

Almost surely, 2^6445866263 is an apocalyptic number.

6445866263 is a deficient number, since it is larger than the sum of its proper divisors (191497).

6445866263 is a wasteful number, since it uses less digits than its factorization.

6445866263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191496.

The product of its digits is 4976640, while the sum is 50.

The square root of 6445866263 is about 80286.1523738683. The cubic root of 6445866263 is about 1861.0602371483.

The spelling of 6445866263 in words is "six billion, four hundred forty-five million, eight hundred sixty-six thousand, two hundred sixty-three".