643346334244449 has 48 divisors (see below), whose sum is σ = 1019467189728000. Its totient is φ = 387711169279200.

The previous prime is 643346334244441. The next prime is 643346334244451. The reversal of 643346334244449 is 944442433643346.

643346334244449 is a `hidden beast` number, since 6 + 4 + 3 + 346 + 3 + 3 + 4 + 244 + 4 + 49 = 666.

It is not a de Polignac number, because 643346334244449 - 2³ = 643346334244441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643346334244441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 398466202 + ... + 400077500.

It is an arithmetic number, because the mean of its divisors is an integer number (21238899786000).

Almost surely, 2^{643346334244449} is an apocalyptic number.

It is an amenable number.

643346334244449 is a deficient number, since it is larger than the sum of its proper divisors (376120855483551).

643346334244449 is a wasteful number, since it uses less digits than its factorization.

643346334244449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634026 (or 1634023 counting only the distinct ones).

The product of its digits is 859963392, while the sum is 63.

The spelling of 643346334244449 in words is "six hundred forty-three trillion, three hundred forty-six billion, three hundred thirty-four million, two hundred forty-four thousand, four hundred forty-nine".