6443981935 has 32 divisors (see below), whose sum is σ = 8186314752. Its totient is φ = 4861866240.

The previous prime is 6443981923. The next prime is 6443981977. The reversal of 6443981935 is 5391893446.

It is a happy number.

It is not a de Polignac number, because 6443981935 - 2⁷ = 6443981807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4111522 + ... + 4113088.

It is an arithmetic number, because the mean of its divisors is an integer number (255822336).

Almost surely, 2^6443981935 is an apocalyptic number.

6443981935 is a deficient number, since it is larger than the sum of its proper divisors (1742332817).

6443981935 is a wasteful number, since it uses less digits than its factorization.

6443981935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its digits is 2799360, while the sum is 52.

The square root of 6443981935 is about 80274.4164413545. The cubic root of 6443981935 is about 1860.8788707993.

The spelling of 6443981935 in words is "six billion, four hundred forty-three million, nine hundred eighty-one thousand, nine hundred thirty-five".