16778945187 has 12 divisors (see below), whose sum is σ = 24342092320. Its totient is φ = 11137115088.

The previous prime is 16778945179. The next prime is 16778945189. The reversal of 16778945187 is 78154987761.

It is not a de Polignac number, because 16778945187 - 2³ = 16778945179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16778945189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4068523 + ... + 4072644.

Almost surely, 2^16778945187 is an apocalyptic number.

16778945187 is a deficient number, since it is larger than the sum of its proper divisors (7563147133).

16778945187 is a wasteful number, since it uses less digits than its factorization.

16778945187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8141402 (or 8141399 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 63.

The spelling of 16778945187 in words is "sixteen billion, seven hundred seventy-eight million, nine hundred forty-five thousand, one hundred eighty-seven".