81996672599 has 2 divisors, whose sum is σ = 81996672600. Its totient is φ = 81996672598.

The previous prime is 81996672551. The next prime is 81996672691. The reversal of 81996672599 is 99527669918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81996672599 - 2²⁰ = 81995624023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81996672529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40998336299 + 40998336300.

It is an arithmetic number, because the mean of its divisors is an integer number (40998336300).

Almost surely, 2^81996672599 is an apocalyptic number.

81996672599 is a deficient number, since it is larger than the sum of its proper divisors (1).

81996672599 is an equidigital number, since it uses as much as digits as its factorization.

81996672599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132269760, while the sum is 71.

The spelling of 81996672599 in words is "eighty-one billion, nine hundred ninety-six million, six hundred seventy-two thousand, five hundred ninety-nine".