16691073291841 has 9 divisors (see below), whose sum is σ = 18073823264931. Its totient is φ = 15407095551432.

The previous prime is 16691073291833. The next prime is 16691073291857. The reversal of 16691073291841 is 14819237019661.

The square root of 16691073291841 is 4085471.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2469093682225 + 14221979609616 = 1571335^2 + 3771204^2 .

It is not a de Polignac number, because 16691073291841 - 2³ = 16691073291833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16691073291811) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 52953990 + ... + 53268256.

Almost surely, 2^{16691073291841} is an apocalyptic number.

16691073291841 is the 4085471-st square number.

16691073291841 is the 2042736-th centered octagonal number.

It is an amenable number.

16691073291841 is a deficient number, since it is larger than the sum of its proper divisors (1382749973090).

16691073291841 is an frugal number, since it uses more digits than its factorization.

16691073291841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628560 (or 314280 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 16691073291841 in words is "sixteen trillion, six hundred ninety-one billion, seventy-three million, two hundred ninety-one thousand, eight hundred forty-one".