6445743266 has 4 divisors (see below), whose sum is σ = 9668614902. Its totient is φ = 3222871632.

The previous prime is 6445743233. The next prime is 6445743313. The reversal of 6445743266 is 6623475446.

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

It can be written as a sum of positive squares in only one way, i.e., 5935932025 + 509811241 = 77045^2 + 22579^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6445743266.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1611435815 + ... + 1611435818.

Almost surely, 2^6445743266 is an apocalyptic number.

6445743266 is a deficient number, since it is larger than the sum of its proper divisors (3222871636).

6445743266 is a wasteful number, since it uses less digits than its factorization.

6445743266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222871635.

The product of its digits is 2903040, while the sum is 47.

The square root of 6445743266 is about 80285.3863788423. The cubic root of 6445743266 is about 1861.0483997798.

The spelling of 6445743266 in words is "six billion, four hundred forty-five million, seven hundred forty-three thousand, two hundred sixty-six".