81922376663 has 2 divisors, whose sum is σ = 81922376664. Its totient is φ = 81922376662.

The previous prime is 81922376621. The next prime is 81922376687. The reversal of 81922376663 is 36667322918.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81922376663 - 2²⁰ = 81921328087 is a prime.

It is a super-2 number, since 2×81922376663² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81922376363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40961188331 + 40961188332.

It is an arithmetic number, because the mean of its divisors is an integer number (40961188332).

Almost surely, 2^81922376663 is an apocalyptic number.

81922376663 is a deficient number, since it is larger than the sum of its proper divisors (1).

81922376663 is an equidigital number, since it uses as much as digits as its factorization.

81922376663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 53.

The spelling of 81922376663 in words is "eighty-one billion, nine hundred twenty-two million, three hundred seventy-six thousand, six hundred sixty-three".