16661172511711 has 64 divisors (see below), whose sum is σ = 22182912460800. Its totient is φ = 12148421193216.

The previous prime is 16661172511699. The next prime is 16661172511721. The reversal of 16661172511711 is 11711527116661.

It is not a de Polignac number, because 16661172511711 - 2²⁹ = 16660635640799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661172511721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28051605 + ... + 28639393.

It is an arithmetic number, because the mean of its divisors is an integer number (346608007200).

Almost surely, 2^{16661172511711} is an apocalyptic number.

16661172511711 is a deficient number, since it is larger than the sum of its proper divisors (5521739949089).

16661172511711 is a wasteful number, since it uses less digits than its factorization.

16661172511711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588328.

The product of its digits is 105840, while the sum is 46.

The spelling of 16661172511711 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, five hundred eleven thousand, seven hundred eleven".