16778849193 has 16 divisors (see below), whose sum is σ = 26319764160. Its totient is φ = 10527905088.

The previous prime is 16778849179. The next prime is 16778849237. The reversal of 16778849193 is 39194887761.

16778849193 is a `hidden beast` number, since 1 + 67 + 7 + 88 + 491 + 9 + 3 = 666.

It is not a de Polignac number, because 16778849193 - 2⁸ = 16778848937 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16778849193.

It is not an unprimeable number, because it can be changed into a prime (16778849693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18277155 + ... + 18278072.

It is an arithmetic number, because the mean of its divisors is an integer number (1644985260).

Almost surely, 2^16778849193 is an apocalyptic number.

It is an amenable number.

16778849193 is a deficient number, since it is larger than the sum of its proper divisors (9540914967).

16778849193 is a wasteful number, since it uses less digits than its factorization.

16778849193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36555253 (or 36555247 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The spelling of 16778849193 in words is "sixteen billion, seven hundred seventy-eight million, eight hundred forty-nine thousand, one hundred ninety-three".