6447566657446 has 4 divisors (see below), whose sum is σ = 9671349986172. Its totient is φ = 3223783328722.

The previous prime is 6447566657437. The next prime is 6447566657471.

It is a happy number.

6447566657446 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×6447566657446² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1611891664360 + ... + 1611891664363.

It is an arithmetic number, because the mean of its divisors is an integer number (2417837496543).

Almost surely, 2^{6447566657446} is an apocalyptic number.

6447566657446 is a deficient number, since it is larger than the sum of its proper divisors (3223783328726).

6447566657446 is a wasteful number, since it uses less digits than its factorization.

6447566657446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223783328725.

The product of its digits is 2438553600, while the sum is 70.

The spelling of 6447566657446 in words is "six trillion, four hundred forty-seven billion, five hundred sixty-six million, six hundred fifty-seven thousand, four hundred forty-six".