643540045346 has 16 divisors (see below), whose sum is σ = 1054467773568. Its totient is φ = 292128690000.

The previous prime is 643540045339. The next prime is 643540045367.

643540045346 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643540045297 and 643540045306.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19458725 + ... + 19491768.

It is an arithmetic number, because the mean of its divisors is an integer number (65904235848).

Almost surely, 2^643540045346 is an apocalyptic number.

643540045346 is a deficient number, since it is larger than the sum of its proper divisors (410927728222).

643540045346 is a wasteful number, since it uses less digits than its factorization.

643540045346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38951257.

The product of its (nonzero) digits is 2073600, while the sum is 44.

The spelling of 643540045346 in words is "six hundred forty-three billion, five hundred forty million, forty-five thousand, three hundred forty-six".