16778849189 has 4 divisors (see below), whose sum is σ = 16784110560. Its totient is φ = 16773587820.

The previous prime is 16778849179. The next prime is 16778849237. The reversal of 16778849189 is 98194887761.

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 a cyclic number.

It is not a de Polignac number, because 16778849189 - 2²⁴ = 16762071973 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 (16778849179) 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, 2625899 + ... + 2632280.

It is an arithmetic number, because the mean of its divisors is an integer number (4196027640).

Almost surely, 2^16778849189 is an apocalyptic number.

It is an amenable number.

16778849189 is a deficient number, since it is larger than the sum of its proper divisors (5261371).

16778849189 is an equidigital number, since it uses as much as digits as its factorization.

16778849189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261370.

The product of its digits is 48771072, while the sum is 68.

The spelling of 16778849189 in words is "sixteen billion, seven hundred seventy-eight million, eight hundred forty-nine thousand, one hundred eighty-nine".