81095263577 has 4 divisors (see below), whose sum is σ = 81564022500. Its totient is φ = 80626504656.

The previous prime is 81095263567. The next prime is 81095263583. The reversal of 81095263577 is 77536259018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77536259018 = 2 ⋅38768129509.

It can be written as a sum of positive squares in 2 ways, for example, as 72051443776 + 9043819801 = 268424^2 + 95099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81095263577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81095263547) 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, 234379202 + ... + 234379547.

It is an arithmetic number, because the mean of its divisors is an integer number (20391005625).

Almost surely, 2^81095263577 is an apocalyptic number.

It is an amenable number.

81095263577 is a deficient number, since it is larger than the sum of its proper divisors (468758923).

81095263577 is a wasteful number, since it uses less digits than its factorization.

81095263577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468758922.

The product of its (nonzero) digits is 3175200, while the sum is 53.

The spelling of 81095263577 in words is "eighty-one billion, ninety-five million, two hundred sixty-three thousand, five hundred seventy-seven".