81793266239718 has 96 divisors (see below), whose sum is σ = 200494823162400. Its totient is φ = 23871474816000.

The previous prime is 81793266239677. The next prime is 81793266239719.

81793266239718 is a `hidden beast` number, since 8 + 179 + 3 + 2 + 6 + 62 + 397 + 1 + 8 = 666.

81793266239718 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81793266239718² (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 (81793266239719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15458973 + ... + 20064056.

It is an arithmetic number, because the mean of its divisors is an integer number (2088487741275).

Almost surely, 2^{81793266239718} is an apocalyptic number.

81793266239718 is an abundant number, since it is smaller than the sum of its proper divisors (118701556922682).

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

81793266239718 is a wasteful number, since it uses less digits than its factorization.

81793266239718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35523478 (or 35523475 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 72.

The spelling of 81793266239718 in words is "eighty-one trillion, seven hundred ninety-three billion, two hundred sixty-six million, two hundred thirty-nine thousand, seven hundred eighteen".