16387777889 has 4 divisors (see below), whose sum is σ = 18728889024. Its totient is φ = 14046666756.

The previous prime is 16387777853. The next prime is 16387777891. The reversal of 16387777889 is 98877778361.

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 16387777889 - 2³² = 12092810593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16387777849) 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, 1170555557 + ... + 1170555570.

It is an arithmetic number, because the mean of its divisors is an integer number (4682222256).

Almost surely, 2^16387777889 is an apocalyptic number.

It is an amenable number.

16387777889 is a deficient number, since it is larger than the sum of its proper divisors (2341111135).

16387777889 is an equidigital number, since it uses as much as digits as its factorization.

16387777889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341111134.

The product of its digits is 199148544, while the sum is 71.

The spelling of 16387777889 in words is "sixteen billion, three hundred eighty-seven million, seven hundred seventy-seven thousand, eight hundred eighty-nine".