1585728658643 has 4 divisors (see below), whose sum is σ = 1589805082320. Its totient is φ = 1581652234968.

The previous prime is 1585728658583. The next prime is 1585728658669. The reversal of 1585728658643 is 3468568275851.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1585728658643 - 2¹² = 1585728654547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1585728658673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2038211255 + ... + 2038212032.

It is an arithmetic number, because the mean of its divisors is an integer number (397451270580).

Almost surely, 2^{1585728658643} is an apocalyptic number.

1585728658643 is a deficient number, since it is larger than the sum of its proper divisors (4076423677).

1585728658643 is an equidigital number, since it uses as much as digits as its factorization.

1585728658643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076423676.

The product of its digits is 387072000, while the sum is 68.

The spelling of 1585728658643 in words is "one trillion, five hundred eighty-five billion, seven hundred twenty-eight million, six hundred fifty-eight thousand, six hundred forty-three".