6440974586 has 16 divisors (see below), whose sum is σ = 10232809704. Its totient is φ = 3030150144.

The previous prime is 6440974537. The next prime is 6440974607. The reversal of 6440974586 is 6854790446.

It can be written as a sum of positive squares in 4 ways, for example, as 5159692561 + 1281282025 = 71831^2 + 35795^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96626 + ... + 149058.

Almost surely, 2^6440974586 is an apocalyptic number.

6440974586 is a deficient number, since it is larger than the sum of its proper divisors (3791835118).

6440974586 is a wasteful number, since it uses less digits than its factorization.

6440974586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56065.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The square root of 6440974586 is about 80255.6825776219. The cubic root of 6440974586 is about 1860.5893405535.

The spelling of 6440974586 in words is "six billion, four hundred forty million, nine hundred seventy-four thousand, five hundred eighty-six".