16778188890 has 24 divisors (see below), whose sum is σ = 43623291348. Its totient is φ = 4474183680.

The previous prime is 16778188859. The next prime is 16778188927. The reversal of 16778188890 is 9888187761.

16778188890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16620108561 + 158080329 = 128919^2 + 12573^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 93212071 + ... + 93212250.

Almost surely, 2^16778188890 is an apocalyptic number.

16778188890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16778188890 is an abundant number, since it is smaller than the sum of its proper divisors (26845102458).

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

16778188890 is a wasteful number, since it uses less digits than its factorization.

16778188890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186424334 (or 186424331 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 63.

The spelling of 16778188890 in words is "sixteen billion, seven hundred seventy-eight million, one hundred eighty-eight thousand, eight hundred ninety".