6445131382 has 16 divisors (see below), whose sum is σ = 9840333312. Its totient is φ = 3165523200.

The previous prime is 6445131349. The next prime is 6445131439. The reversal of 6445131382 is 2831315446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99963 + ... + 151270.

It is an arithmetic number, because the mean of its divisors is an integer number (615020832).

Almost surely, 2^6445131382 is an apocalyptic number.

6445131382 is a deficient number, since it is larger than the sum of its proper divisors (3395201930).

6445131382 is a wasteful number, since it uses less digits than its factorization.

6445131382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251463.

The product of its digits is 69120, while the sum is 37.

The square root of 6445131382 is about 80281.5756073584. The cubic root of 6445131382 is about 1860.9895091432.

The spelling of 6445131382 in words is "six billion, four hundred forty-five million, one hundred thirty-one thousand, three hundred eighty-two".