16787472085 has 4 divisors (see below), whose sum is σ = 20144966508. Its totient is φ = 13429977664.

The previous prime is 16787472073. The next prime is 16787472089. The reversal of 16787472085 is 58027478761.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8112785041 + 8674687044 = 90071^2 + 93138^2 .

It is a cyclic number.

It is not a de Polignac number, because 16787472085 - 2⁹ = 16787471573 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 (16787472089) 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, 1678747204 + ... + 1678747213.

It is an arithmetic number, because the mean of its divisors is an integer number (5036241627).

Almost surely, 2^16787472085 is an apocalyptic number.

It is an amenable number.

16787472085 is a deficient number, since it is larger than the sum of its proper divisors (3357494423).

16787472085 is an equidigital number, since it uses as much as digits as its factorization.

16787472085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357494422.

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 16787472085 in words is "sixteen billion, seven hundred eighty-seven million, four hundred seventy-two thousand, eighty-five".