81281080611010 has 48 divisors (see below), whose sum is σ = 170228397165120. Its totient is φ = 27861942457440.

The previous prime is 81281080610971. The next prime is 81281080611019. The reversal of 81281080611010 is 1011608018218.

It is a super-2 number, since 2×81281080611010² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81281080611019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15096096 + ... + 19759915.

It is an arithmetic number, because the mean of its divisors is an integer number (3546424940940).

Almost surely, 2^{81281080611010} is an apocalyptic number.

81281080611010 is an abundant number, since it is smaller than the sum of its proper divisors (88947316554110).

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

81281080611010 is a wasteful number, since it uses less digits than its factorization.

81281080611010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34860791 (or 34860784 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 37.

Adding to 81281080611010 its reverse (1011608018218), we get a palindrome (82292688629228).

The spelling of 81281080611010 in words is "eighty-one trillion, two hundred eighty-one billion, eighty million, six hundred eleven thousand, ten".