16387777845 has 56 divisors (see below), whose sum is σ = 30435835392. Its totient is φ = 8458149600.

The previous prime is 16387777843. The next prime is 16387777849. The reversal of 16387777845 is 54877778361.

16387777845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16387777845 - 2¹ = 16387777843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16387777843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 40480 + ... + 185510.

Almost surely, 2^16387777845 is an apocalyptic number.

16387777845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16387777845 is a deficient number, since it is larger than the sum of its proper divisors (14048057547).

16387777845 is an equidigital number, since it uses as much as digits as its factorization.

16387777845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145085 (or 145070 counting only the distinct ones).

The product of its digits is 55319040, while the sum is 63.

The spelling of 16387777845 in words is "sixteen billion, three hundred eighty-seven million, seven hundred seventy-seven thousand, eight hundred forty-five".