81771230795 has 4 divisors (see below), whose sum is σ = 98125476960. Its totient is φ = 65416984632.

The previous prime is 81771230773. The next prime is 81771230803. The reversal of 81771230795 is 59703217718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81771230795 - 2¹⁴ = 81771214411 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8177123075 + ... + 8177123084.

It is an arithmetic number, because the mean of its divisors is an integer number (24531369240).

Almost surely, 2^81771230795 is an apocalyptic number.

81771230795 is a deficient number, since it is larger than the sum of its proper divisors (16354246165).

81771230795 is a wasteful number, since it uses less digits than its factorization.

81771230795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16354246164.

The product of its (nonzero) digits is 740880, while the sum is 50.

The spelling of 81771230795 in words is "eighty-one billion, seven hundred seventy-one million, two hundred thirty thousand, seven hundred ninety-five".