643246642346 has 32 divisors (see below), whose sum is σ = 1208656028160. Its totient is φ = 249427810800.

The previous prime is 643246642333. The next prime is 643246642351.

643246642346 is nontrivially palindromic in base 10.

643246642346 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643246642294 and 643246642303.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9865436 + ... + 9930423.

It is an arithmetic number, because the mean of its divisors is an integer number (37770500880).

Almost surely, 2^643246642346 is an apocalyptic number.

643246642346 is a deficient number, since it is larger than the sum of its proper divisors (565409385814).

643246642346 is a wasteful number, since it uses less digits than its factorization.

643246642346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19796090.

The product of its digits is 11943936, while the sum is 50.

The spelling of 643246642346 in words is "six hundred forty-three billion, two hundred forty-six million, six hundred forty-two thousand, three hundred forty-six".