1646385716647 has 12 divisors (see below), whose sum is σ = 1926932985336. Its totient is φ = 1402530156720.

The previous prime is 1646385716611. The next prime is 1646385716669. The reversal of 1646385716647 is 7466175836461.

It is not a de Polignac number, because 1646385716647 - 2²⁷ = 1646251498919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646385716147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103058604 + ... + 103074577.

It is an arithmetic number, because the mean of its divisors is an integer number (160577748778).

Almost surely, 2^{1646385716647} is an apocalyptic number.

1646385716647 is a deficient number, since it is larger than the sum of its proper divisors (280547268689).

1646385716647 is a wasteful number, since it uses less digits than its factorization.

1646385716647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206133358 (or 206133351 counting only the distinct ones).

The product of its digits is 121927680, while the sum is 64.

The spelling of 1646385716647 in words is "one trillion, six hundred forty-six billion, three hundred eighty-five million, seven hundred sixteen thousand, six hundred forty-seven".