81922376671 has 4 divisors (see below), whose sum is σ = 81929980600. Its totient is φ = 81914772744.

The previous prime is 81922376663. The next prime is 81922376687. The reversal of 81922376671 is 17667322918.

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 81922376671 - 2³ = 81922376663 is a prime.

It is a super-2 number, since 2×81922376671² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81922376621) 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, 3785781 + ... + 3807358.

It is an arithmetic number, because the mean of its divisors is an integer number (20482495150).

Almost surely, 2^81922376671 is an apocalyptic number.

81922376671 is a deficient number, since it is larger than the sum of its proper divisors (7603929).

81922376671 is a wasteful number, since it uses less digits than its factorization.

81922376671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7603928.

The product of its digits is 1524096, while the sum is 52.

The spelling of 81922376671 in words is "eighty-one billion, nine hundred twenty-two million, three hundred seventy-six thousand, six hundred seventy-one".