81177671341 has 4 divisors (see below), whose sum is σ = 87422107612. Its totient is φ = 74933235072.

The previous prime is 81177671327. The next prime is 81177671357. The reversal of 81177671341 is 14317677118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14317677118 = 2 ⋅7158838559.

It can be written as a sum of positive squares in 2 ways, for example, as 21507395716 + 59670275625 = 146654^2 + 244275^2 .

It is a cyclic number.

It is not a de Polignac number, because 81177671341 - 2⁷ = 81177671213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81177671291 and 81177671300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81177671371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3122218116 + ... + 3122218141.

It is an arithmetic number, because the mean of its divisors is an integer number (21855526903).

Almost surely, 2^81177671341 is an apocalyptic number.

It is an amenable number.

81177671341 is a deficient number, since it is larger than the sum of its proper divisors (6244436271).

81177671341 is a wasteful number, since it uses less digits than its factorization.

81177671341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6244436270.

The product of its digits is 197568, while the sum is 46.

The spelling of 81177671341 in words is "eighty-one billion, one hundred seventy-seven million, six hundred seventy-one thousand, three hundred forty-one".