643891198346 has 32 divisors (see below), whose sum is σ = 1055060159616. Its totient is φ = 292283640000.

The previous prime is 643891198337. The next prime is 643891198361.

643891198346 is nontrivially palindromic in base 10.

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, 65027996 + ... + 65037896.

It is an arithmetic number, because the mean of its divisors is an integer number (32970629988).

Almost surely, 2^643891198346 is an apocalyptic number.

643891198346 is a deficient number, since it is larger than the sum of its proper divisors (411168961270).

643891198346 is a wasteful number, since it uses less digits than its factorization.

643891198346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13598.

The product of its digits is 26873856, while the sum is 62.

The spelling of 643891198346 in words is "six hundred forty-three billion, eight hundred ninety-one million, one hundred ninety-eight thousand, three hundred forty-six".