16661172206471 has 8 divisors (see below), whose sum is σ = 17974670829360. Its totient is φ = 15352226439552.

The previous prime is 16661172206453. The next prime is 16661172206489. The reversal of 16661172206471 is 17460227116661.

It is an interprime number because it is at equal distance from previous prime (16661172206453) and next prime (16661172206489).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16661172206471 - 2⁶ = 16661172206407 is a prime.

It is a super-3 number, since 3×16661172206471³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661172206411) 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 7 ways as a sum of consecutive naturals, for example, 1138206386 + ... + 1138221023.

It is an arithmetic number, because the mean of its divisors is an integer number (2246833853670).

Almost surely, 2^{16661172206471} is an apocalyptic number.

16661172206471 is a deficient number, since it is larger than the sum of its proper divisors (1313498622889).

16661172206471 is a wasteful number, since it uses less digits than its factorization.

16661172206471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276427985.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 16661172206471 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, two hundred six thousand, four hundred seventy-one".