6441378266 has 8 divisors (see below), whose sum is σ = 9669932820. Its totient is φ = 3218067328.

The previous prime is 6441378253. The next prime is 6441378301. The reversal of 6441378266 is 6628731446.

It can be written as a sum of positive squares in 2 ways, for example, as 5194229041 + 1247149225 = 72071^2 + 35315^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 6441378266.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307831 + ... + 1312746.

Almost surely, 2^6441378266 is an apocalyptic number.

6441378266 is a deficient number, since it is larger than the sum of its proper divisors (3228554554).

6441378266 is a wasteful number, since it uses less digits than its factorization.

6441378266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621808.

The product of its digits is 1161216, while the sum is 47.

The square root of 6441378266 is about 80258.1975003177. The cubic root of 6441378266 is about 1860.6282097756.

The spelling of 6441378266 in words is "six billion, four hundred forty-one million, three hundred seventy-eight thousand, two hundred sixty-six".