643678876346 has 64 divisors (see below), whose sum is σ = 1112760529920. Its totient is φ = 276396637440.

The previous prime is 643678876339. The next prime is 643678876411.

643678876346 is nontrivially palindromic in base 10.

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, 16161485 + ... + 16201263.

It is an arithmetic number, because the mean of its divisors is an integer number (17386883280).

Almost surely, 2^643678876346 is an apocalyptic number.

643678876346 is a deficient number, since it is larger than the sum of its proper divisors (469081653574).

643678876346 is a wasteful number, since it uses less digits than its factorization.

643678876346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40211.

The product of its digits is 585252864, while the sum is 68.

The spelling of 643678876346 in words is "six hundred forty-three billion, six hundred seventy-eight million, eight hundred seventy-six thousand, three hundred forty-six".