9042171918681 has 16 divisors (see below), whose sum is σ = 13157504778240. Its totient is φ = 5477914728720.

The previous prime is 9042171918607. The next prime is 9042171918713. The reversal of 9042171918681 is 1868191712409.

It is not a de Polignac number, because 9042171918681 - 2¹⁵ = 9042171885913 is a prime.

It is a super-2 number, since 2×9042171918681² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9042171218681) 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, 54652761 + ... + 54817958.

It is an arithmetic number, because the mean of its divisors is an integer number (822344048640).

Almost surely, 2^{9042171918681} is an apocalyptic number.

It is an amenable number.

9042171918681 is a deficient number, since it is larger than the sum of its proper divisors (4115332859559).

9042171918681 is a wasteful number, since it uses less digits than its factorization.

9042171918681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109473236.

The product of its (nonzero) digits is 1741824, while the sum is 57.

The spelling of 9042171918681 in words is "nine trillion, forty-two billion, one hundred seventy-one million, nine hundred eighteen thousand, six hundred eighty-one".