81717170606 has 4 divisors (see below), whose sum is σ = 122575755912. Its totient is φ = 40858585302.

The previous prime is 81717170581. The next prime is 81717170609. The reversal of 81717170606 is 60607171718.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×81717170606³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81717170609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20429292650 + ... + 20429292653.

It is an arithmetic number, because the mean of its divisors is an integer number (30643938978).

Almost surely, 2^81717170606 is an apocalyptic number.

81717170606 is a deficient number, since it is larger than the sum of its proper divisors (40858585306).

81717170606 is a wasteful number, since it uses less digits than its factorization.

81717170606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40858585305.

The product of its (nonzero) digits is 98784, while the sum is 44.

The spelling of 81717170606 in words is "eighty-one billion, seven hundred seventeen million, one hundred seventy thousand, six hundred six".