6644263398 has 16 divisors (see below), whose sum is σ = 13293791040. Its totient is φ = 2213877096.

The previous prime is 6644263363. The next prime is 6644263403. The reversal of 6644263398 is 8933624466.

It is a super-2 number, since 2×6644263398² = 88292472204005012808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6644263398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202840 + ... + 233307.

It is an arithmetic number, because the mean of its divisors is an integer number (830861940).

Almost surely, 2^6644263398 is an apocalyptic number.

6644263398 is an abundant number, since it is smaller than the sum of its proper divisors (6649527642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6644263398 is a wasteful number, since it uses less digits than its factorization.

6644263398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438691.

The product of its digits is 4478976, while the sum is 51.

The square root of 6644263398 is about 81512.3511990668. The cubic root of 6644263398 is about 1879.9614634850.

The spelling of 6644263398 in words is "six billion, six hundred forty-four million, two hundred sixty-three thousand, three hundred ninety-eight".