81769376071 has 4 divisors (see below), whose sum is σ = 83670989512. Its totient is φ = 79867762632.

The previous prime is 81769376041. The next prime is 81769376089. The reversal of 81769376071 is 17067396718.

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 81769376071 - 2²³ = 81760987463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81769376021) 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, 950806656 + ... + 950806741.

It is an arithmetic number, because the mean of its divisors is an integer number (20917747378).

Almost surely, 2^81769376071 is an apocalyptic number.

81769376071 is a deficient number, since it is larger than the sum of its proper divisors (1901613441).

81769376071 is a wasteful number, since it uses less digits than its factorization.

81769376071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901613440.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 81769376071 in words is "eighty-one billion, seven hundred sixty-nine million, three hundred seventy-six thousand, seventy-one".