81707316982198 has 8 divisors (see below), whose sum is σ = 122594729539680. Its totient is φ = 40842407135640.

The previous prime is 81707316982177. The next prime is 81707316982199. The reversal of 81707316982198 is 89128961370718.

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

It is a super-2 number, since 2×81707316982198² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81707316982199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5625668653 + ... + 5625683176.

It is an arithmetic number, because the mean of its divisors is an integer number (15324341192460).

Almost surely, 2^{81707316982198} is an apocalyptic number.

81707316982198 is a deficient number, since it is larger than the sum of its proper divisors (40887412557482).

81707316982198 is a wasteful number, since it uses less digits than its factorization.

81707316982198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11251355462.

The product of its (nonzero) digits is 73156608, while the sum is 70.

The spelling of 81707316982198 in words is "eighty-one trillion, seven hundred seven billion, three hundred sixteen million, nine hundred eighty-two thousand, one hundred ninety-eight".