16778653538816 has 40 divisors (see below), whose sum is σ = 36103346766564. Its totient is φ = 7743993937920.

The previous prime is 16778653538809. The next prime is 16778653538831. The reversal of 16778653538816 is 61883535687761.

It can be written as a sum of positive squares in 2 ways, for example, as 12027578886400 + 4751074652416 = 3468080^2 + 2179696^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1260409025 + ... + 1260422336.

Almost surely, 2^{16778653538816} is an apocalyptic number.

16778653538816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16778653538816 is an abundant number, since it is smaller than the sum of its proper divisors (19324693227748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16778653538816 is an equidigital number, since it uses as much as digits as its factorization.

16778653538816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2520831392 (or 2520831376 counting only the distinct ones).

The product of its digits is 1219276800, while the sum is 74.

The spelling of 16778653538816 in words is "sixteen trillion, seven hundred seventy-eight billion, six hundred fifty-three million, five hundred thirty-eight thousand, eight hundred sixteen".