16194267665 has 4 divisors (see below), whose sum is σ = 19433121204. Its totient is φ = 12955414128.

The previous prime is 16194267641. The next prime is 16194267679. The reversal of 16194267665 is 56676249161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56676249161 = 7 ⋅8096607023.

It can be written as a sum of positive squares in 2 ways, for example, as 5138165761 + 11056101904 = 71681^2 + 105148^2 .

It is a cyclic number.

It is not a de Polignac number, because 16194267665 - 2²⁰ = 16193219089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619426762 + ... + 1619426771.

It is an arithmetic number, because the mean of its divisors is an integer number (4858280301).

Almost surely, 2^16194267665 is an apocalyptic number.

It is an amenable number.

16194267665 is a deficient number, since it is larger than the sum of its proper divisors (3238853539).

16194267665 is an equidigital number, since it uses as much as digits as its factorization.

16194267665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238853538.

The product of its digits is 3265920, while the sum is 53.

The spelling of 16194267665 in words is "sixteen billion, one hundred ninety-four million, two hundred sixty-seven thousand, six hundred sixty-five".