16685020369 has 4 divisors (see below), whose sum is σ = 16724841840. Its totient is φ = 16645198900.

The previous prime is 16685020357. The next prime is 16685020381. The reversal of 16685020369 is 96302058661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (16685020357) and next prime (16685020381).

It is a cyclic number.

It is not a de Polignac number, because 16685020369 - 2¹⁷ = 16684889297 is a prime.

It is a super-2 number, since 2×16685020369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16685020309) 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, 19910107 + ... + 19910944.

It is an arithmetic number, because the mean of its divisors is an integer number (4181210460).

Almost surely, 2^16685020369 is an apocalyptic number.

It is an amenable number.

16685020369 is a deficient number, since it is larger than the sum of its proper divisors (39821471).

16685020369 is an equidigital number, since it uses as much as digits as its factorization.

16685020369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39821470.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 16685020369 in words is "sixteen billion, six hundred eighty-five million, twenty thousand, three hundred sixty-nine".