6445137858 has 32 divisors (see below), whose sum is σ = 13579315200. Its totient is φ = 2033716176.

The previous prime is 6445137851. The next prime is 6445137883. The reversal of 6445137858 is 8587315446.

It is a self number, because there is not a number n which added to its sum of digits gives 6445137858.

It is not an unprimeable number, because it can be changed into a prime (6445137851) 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, 128935 + ... + 171797.

It is an arithmetic number, because the mean of its divisors is an integer number (424353600).

Almost surely, 2^6445137858 is an apocalyptic number.

6445137858 is an abundant number, since it is smaller than the sum of its proper divisors (7134177342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6445137858 is a wasteful number, since it uses less digits than its factorization.

6445137858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44206.

The product of its digits is 3225600, while the sum is 51.

The square root of 6445137858 is about 80281.6159403882. The cubic root of 6445137858 is about 1860.9901324438.

The spelling of 6445137858 in words is "six billion, four hundred forty-five million, one hundred thirty-seven thousand, eight hundred fifty-eight".