16566172041391 has 8 divisors (see below), whose sum is σ = 18932924218784. Its totient is φ = 14199458906880.

The previous prime is 16566172041373. The next prime is 16566172041439. The reversal of 16566172041391 is 19314027166561.

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 16566172041391 - 2²¹ = 16566169944239 is a prime.

It is a super-2 number, since 2×16566172041391² (a number of 27 digits) contains 22 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 (16566172021391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8845770 + ... + 10553671.

It is an arithmetic number, because the mean of its divisors is an integer number (2366615527348).

Almost surely, 2^{16566172041391} is an apocalyptic number.

16566172041391 is a deficient number, since it is larger than the sum of its proper divisors (2366752177393).

16566172041391 is a wasteful number, since it uses less digits than its factorization.

16566172041391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19521441.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 16566172041391 in words is "sixteen trillion, five hundred sixty-six billion, one hundred seventy-two million, forty-one thousand, three hundred ninety-one".