643682402366 has 8 divisors (see below), whose sum is σ = 965537876160. Its totient is φ = 321836443648.

The previous prime is 643682402347. The next prime is 643682402383. The reversal of 643682402366 is 663204286346.

643682402366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2207171 + ... + 2481726.

It is an arithmetic number, because the mean of its divisors is an integer number (120692234520).

Almost surely, 2^643682402366 is an apocalyptic number.

643682402366 is a deficient number, since it is larger than the sum of its proper divisors (321855473794).

643682402366 is a wasteful number, since it uses less digits than its factorization.

643682402366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4757538.

The product of its (nonzero) digits is 5971968, while the sum is 50.

The spelling of 643682402366 in words is "six hundred forty-three billion, six hundred eighty-two million, four hundred two thousand, three hundred sixty-six".