643762267346 has 64 divisors (see below), whose sum is σ = 1115943713280. Its totient is φ = 275771516160.

The previous prime is 643762267319. The next prime is 643762267361.

643762267346 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643762267291 and 643762267300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11156000 + ... + 11213556.

It is an arithmetic number, because the mean of its divisors is an integer number (17436620520).

Almost surely, 2^643762267346 is an apocalyptic number.

643762267346 is a deficient number, since it is larger than the sum of its proper divisors (472181445934).

643762267346 is a wasteful number, since it uses less digits than its factorization.

643762267346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58019.

The product of its digits is 36578304, while the sum is 56.

The spelling of 643762267346 in words is "six hundred forty-three billion, seven hundred sixty-two million, two hundred sixty-seven thousand, three hundred forty-six".