8166767972181 has 32 divisors (see below), whose sum is σ = 13524828683520. Its totient is φ = 4268225124864.

The previous prime is 8166767972137. The next prime is 8166767972189. The reversal of 8166767972181 is 1812797676618.

It is not a de Polignac number, because 8166767972181 - 2⁶ = 8166767972117 is a prime.

It is a super-2 number, since 2×8166767972181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8166767972189) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137194560 + ... + 137254073.

It is an arithmetic number, because the mean of its divisors is an integer number (422650896360).

Almost surely, 2^{8166767972181} is an apocalyptic number.

It is an amenable number.

8166767972181 is a deficient number, since it is larger than the sum of its proper divisors (5358060711339).

8166767972181 is a wasteful number, since it uses less digits than its factorization.

8166767972181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274448765.

The product of its digits is 85349376, while the sum is 69.

The spelling of 8166767972181 in words is "eight trillion, one hundred sixty-six billion, seven hundred sixty-seven million, nine hundred seventy-two thousand, one hundred eighty-one".