81041113444 has 6 divisors (see below), whose sum is σ = 141821948534. Its totient is φ = 40520556720.

The previous prime is 81041113411. The next prime is 81041113469. The reversal of 81041113444 is 44431114018.

It can be written as a sum of positive squares in only one way, i.e., 80719628544 + 321484900 = 284112^2 + 17930^2 .

It is a super-2 number, since 2×81041113444² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130139177 + ... + 10130139184.

Almost surely, 2^81041113444 is an apocalyptic number.

It is an amenable number.

81041113444 is a deficient number, since it is larger than the sum of its proper divisors (60780835090).

81041113444 is a wasteful number, since it uses less digits than its factorization.

81041113444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20260278365 (or 20260278363 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The spelling of 81041113444 in words is "eighty-one billion, forty-one million, one hundred thirteen thousand, four hundred forty-four".