81742522166 has 8 divisors (see below), whose sum is σ = 123056433120. Its totient is φ = 40723711128.

The previous prime is 81742522163. The next prime is 81742522177. The reversal of 81742522166 is 66122524718.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81742522163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73774286 + ... + 73775393.

It is an arithmetic number, because the mean of its divisors is an integer number (15382054140).

Almost surely, 2^81742522166 is an apocalyptic number.

81742522166 is a deficient number, since it is larger than the sum of its proper divisors (41313910954).

81742522166 is a wasteful number, since it uses less digits than its factorization.

81742522166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147549958.

The product of its digits is 322560, while the sum is 44.

The spelling of 81742522166 in words is "eighty-one billion, seven hundred forty-two million, five hundred twenty-two thousand, one hundred sixty-six".