81741705171 has 16 divisors (see below), whose sum is σ = 131114515200. Its totient is φ = 44251148448.

The previous prime is 81741705167. The next prime is 81741705187. The reversal of 81741705171 is 17150714718.

It is not a de Polignac number, because 81741705171 - 2² = 81741705167 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81741705121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102432816 + ... + 102433613.

It is an arithmetic number, because the mean of its divisors is an integer number (8194657200).

Almost surely, 2^81741705171 is an apocalyptic number.

81741705171 is a deficient number, since it is larger than the sum of its proper divisors (49372810029).

81741705171 is a wasteful number, since it uses less digits than its factorization.

81741705171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204866458.

The product of its (nonzero) digits is 54880, while the sum is 42.

The spelling of 81741705171 in words is "eighty-one billion, seven hundred forty-one million, seven hundred five thousand, one hundred seventy-one".