6446445277 has 4 divisors (see below), whose sum is σ = 6487505596. Its totient is φ = 6405384960.

The previous prime is 6446445263. The next prime is 6446445307. The reversal of 6446445277 is 7725446446.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2297668356 + 4148776921 = 47934^2 + 64411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6446445277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6446445277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446445377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20529924 + ... + 20530237.

It is an arithmetic number, because the mean of its divisors is an integer number (1621876399).

Almost surely, 2^6446445277 is an apocalyptic number.

It is an amenable number.

6446445277 is a deficient number, since it is larger than the sum of its proper divisors (41060319).

6446445277 is a wasteful number, since it uses less digits than its factorization.

6446445277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41060318.

The product of its digits is 4515840, while the sum is 49.

The square root of 6446445277 is about 80289.7582322926. The cubic root of 6446445277 is about 1861.1159600785.

The spelling of 6446445277 in words is "six billion, four hundred forty-six million, four hundred forty-five thousand, two hundred seventy-seven".