643443262344346 has 16 divisors (see below), whose sum is σ = 974731184050248. Its totient is φ = 318532934344000.

The previous prime is 643443262344329. The next prime is 643443262344349.

643443262344346 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 347810004612225 + 295633257732121 = 18649665^2 + 17193989^2 .

It is a super-2 number, since 2×643443262344346² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643443262344349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2731416 + ... + 35977036.

Almost surely, 2^{643443262344346} is an apocalyptic number.

643443262344346 is a deficient number, since it is larger than the sum of its proper divisors (331287921705902).

643443262344346 is a wasteful number, since it uses less digits than its factorization.

643443262344346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33341537.

The product of its digits is 286654464, while the sum is 58.

The spelling of 643443262344346 in words is "six hundred forty-three trillion, four hundred forty-three billion, two hundred sixty-two million, three hundred forty-four thousand, three hundred forty-six".