6445641107247 has 16 divisors (see below), whose sum is σ = 8604128746080. Its totient is φ = 4292125673472.

The previous prime is 6445641107231. The next prime is 6445641107249. The reversal of 6445641107247 is 7427011465446.

It is not a de Polignac number, because 6445641107247 - 2⁴ = 6445641107231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6445641107247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445641107249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13461079 + ... + 13931687.

It is an arithmetic number, because the mean of its divisors is an integer number (537758046630).

Almost surely, 2^{6445641107247} is an apocalyptic number.

6445641107247 is a deficient number, since it is larger than the sum of its proper divisors (2158487638833).

6445641107247 is a wasteful number, since it uses less digits than its factorization.

6445641107247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475882.

The product of its (nonzero) digits is 4515840, while the sum is 51.

The spelling of 6445641107247 in words is "six trillion, four hundred forty-five billion, six hundred forty-one million, one hundred seven thousand, two hundred forty-seven".