643240042346 has 16 divisors (see below), whose sum is σ = 1052595870048. Its totient is φ = 292375933200.

The previous prime is 643240042339. The next prime is 643240042373.

643240042346 is nontrivially palindromic in base 10.

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, 932456 + ... + 1468316.

It is an arithmetic number, because the mean of its divisors is an integer number (65787241878).

Almost surely, 2^643240042346 is an apocalyptic number.

643240042346 is a deficient number, since it is larger than the sum of its proper divisors (409355827702).

643240042346 is a wasteful number, since it uses less digits than its factorization.

643240042346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590437.

The product of its (nonzero) digits is 331776, while the sum is 38.

It can be divided in two parts, 6432400 and 42346, that added together give a palindrome (6474746).

The spelling of 643240042346 in words is "six hundred forty-three billion, two hundred forty million, forty-two thousand, three hundred forty-six".