643542727245346 has 16 divisors (see below), whose sum is σ = 1006319128912128. Its totient is φ = 308308556646000.

The previous prime is 643542727245337. The next prime is 643542727245349.

643542727245346 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (643542727245349) 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, 51384753180 + ... + 51384765703.

It is an arithmetic number, because the mean of its divisors is an integer number (62894945557008).

Almost surely, 2^{643542727245346} is an apocalyptic number.

643542727245346 is a deficient number, since it is larger than the sum of its proper divisors (362776401666782).

643542727245346 is a wasteful number, since it uses less digits than its factorization.

643542727245346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102769519017.

The product of its digits is 812851200, while the sum is 64.

The spelling of 643542727245346 in words is "six hundred forty-three trillion, five hundred forty-two billion, seven hundred twenty-seven million, two hundred forty-five thousand, three hundred forty-six".