643587949785346 has 8 divisors (see below), whose sum is σ = 965762146002960. Its totient is φ = 321667234451028.

The previous prime is 643587949785289. The next prime is 643587949785377.

643587949785346 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63370214476 + ... + 63370224631.

It is an arithmetic number, because the mean of its divisors is an integer number (120720268250370).

Almost surely, 2^{643587949785346} is an apocalyptic number.

643587949785346 is a deficient number, since it is larger than the sum of its proper divisors (322174196217614).

643587949785346 is a wasteful number, since it uses less digits than its factorization.

643587949785346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126740441648.

The product of its digits is 131681894400, while the sum is 88.

The spelling of 643587949785346 in words is "six hundred forty-three trillion, five hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-five thousand, three hundred forty-six".