16585643699 has 4 divisors (see below), whose sum is σ = 16621159464. Its totient is φ = 16550127936.

The previous prime is 16585643693. The next prime is 16585643713. The reversal of 16585643699 is 99634658561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99634658561 = 463 ⋅215193647.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16585643699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16585643693) 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, 17757182 + ... + 17758115.

It is an arithmetic number, because the mean of its divisors is an integer number (4155289866).

Almost surely, 2^16585643699 is an apocalyptic number.

16585643699 is a deficient number, since it is larger than the sum of its proper divisors (35515765).

16585643699 is an equidigital number, since it uses as much as digits as its factorization.

16585643699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35515764.

The product of its digits is 41990400, while the sum is 62.

The spelling of 16585643699 in words is "sixteen billion, five hundred eighty-five million, six hundred forty-three thousand, six hundred ninety-nine".