81707317113270 has 32 divisors (see below), whose sum is σ = 196098819586560. Its totient is φ = 21788478061920.

The previous prime is 81707317113203. The next prime is 81707317113277. The reversal of 81707317113270 is 7231171370718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81707317113277) 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, 3944140 + ... + 13377999.

It is an arithmetic number, because the mean of its divisors is an integer number (6128088112080).

Almost surely, 2^{81707317113270} is an apocalyptic number.

81707317113270 is an abundant number, since it is smaller than the sum of its proper divisors (114391502473290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81707317113270 is a wasteful number, since it uses less digits than its factorization.

81707317113270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17479380.

The product of its (nonzero) digits is 345744, while the sum is 48.

Adding to 81707317113270 its reverse (7231171370718), we get a palindrome (88938488483988).

The spelling of 81707317113270 in words is "eighty-one trillion, seven hundred seven billion, three hundred seventeen million, one hundred thirteen thousand, two hundred seventy".