16661840053845 has 32 divisors (see below), whose sum is σ = 31175908042752. Its totient is φ = 7439705324352.

The previous prime is 16661840053823. The next prime is 16661840053907. The reversal of 16661840053845 is 54835004816661.

It is a happy number.

It is not a de Polignac number, because 16661840053845 - 2¹⁴ = 16661840037461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1845160497 + ... + 1845169526.

It is an arithmetic number, because the mean of its divisors is an integer number (974247126336).

Almost surely, 2^{16661840053845} is an apocalyptic number.

16661840053845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16661840053845 is a deficient number, since it is larger than the sum of its proper divisors (14514067988907).

16661840053845 is a wasteful number, since it uses less digits than its factorization.

16661840053845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690330081.

The product of its (nonzero) digits is 16588800, while the sum is 57.

The spelling of 16661840053845 in words is "sixteen trillion, six hundred sixty-one billion, eight hundred forty million, fifty-three thousand, eight hundred forty-five".