643984489346 has 8 divisors (see below), whose sum is σ = 1053792800784. Its totient is φ = 292720222420.

The previous prime is 643984489259. The next prime is 643984489373.

643984489346 is nontrivially palindromic in base 10.

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

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, 14636011100 + ... + 14636011143.

It is an arithmetic number, because the mean of its divisors is an integer number (131724100098).

Almost surely, 2^643984489346 is an apocalyptic number.

643984489346 is a deficient number, since it is larger than the sum of its proper divisors (409808311438).

643984489346 is a wasteful number, since it uses less digits than its factorization.

643984489346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29272022256.

The product of its digits is 429981696, while the sum is 68.

The spelling of 643984489346 in words is "six hundred forty-three billion, nine hundred eighty-four million, four hundred eighty-nine thousand, three hundred forty-six".