646743068785 has 16 divisors (see below), whose sum is σ = 846661833792. Its totient is φ = 470349505600.

The previous prime is 646743068779. The next prime is 646743068833. The reversal of 646743068785 is 587860347646.

It is not a de Polignac number, because 646743068785 - 2²⁹ = 646206197873 is a prime.

It is a Duffinian number.

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, 4309227 + ... + 4456783.

It is an arithmetic number, because the mean of its divisors is an integer number (52916364612).

Almost surely, 2^646743068785 is an apocalyptic number.

It is an amenable number.

646743068785 is a deficient number, since it is larger than the sum of its proper divisors (199918765007).

646743068785 is a wasteful number, since it uses less digits than its factorization.

646743068785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227264.

The product of its (nonzero) digits is 162570240, while the sum is 64.

The spelling of 646743068785 in words is "six hundred forty-six billion, seven hundred forty-three million, sixty-eight thousand, seven hundred eighty-five".