17661442023211 has 16 divisors (see below), whose sum is σ = 21259971244800. Its totient is φ = 14332763598048.

The previous prime is 17661442023157. The next prime is 17661442023319. The reversal of 17661442023211 is 11232024416671.

It is not a de Polignac number, because 17661442023211 - 2¹¹ = 17661442021163 is a prime.

It is a super-2 number, since 2×17661442023211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17661442023011) 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 15 ways as a sum of consecutive naturals, for example, 40795420 + ... + 41226073.

It is an arithmetic number, because the mean of its divisors is an integer number (1328748202800).

Almost surely, 2^{17661442023211} is an apocalyptic number.

17661442023211 is a deficient number, since it is larger than the sum of its proper divisors (3598529221589).

17661442023211 is a wasteful number, since it uses less digits than its factorization.

17661442023211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82023138.

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 17661442023211 its reverse (11232024416671), we get a palindrome (28893466439882).

The spelling of 17661442023211 in words is "seventeen trillion, six hundred sixty-one billion, four hundred forty-two million, twenty-three thousand, two hundred eleven".