82581101181 has 16 divisors (see below), whose sum is σ = 122348358720. Its totient is φ = 55051373520.

The previous prime is 82581101147. The next prime is 82581101201. The reversal of 82581101181 is 18110118528.

It is a happy number.

It is not a de Polignac number, because 82581101181 - 2¹⁴ = 82581084797 is a prime.

It is a super-2 number, since 2×82581101181² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82581101381) 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, 596746 + ... + 721988.

It is an arithmetic number, because the mean of its divisors is an integer number (7646772420).

Almost surely, 2^82581101181 is an apocalyptic number.

It is an amenable number.

82581101181 is a deficient number, since it is larger than the sum of its proper divisors (39767257539).

82581101181 is a wasteful number, since it uses less digits than its factorization.

82581101181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149673 (or 149667 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 36.

The spelling of 82581101181 in words is "eighty-two billion, five hundred eighty-one million, one hundred one thousand, one hundred eighty-one".