81600888899 has 2 divisors, whose sum is σ = 81600888900. Its totient is φ = 81600888898.

The previous prime is 81600888883. The next prime is 81600888911. The reversal of 81600888899 is 99888800618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81600888899 - 2⁴ = 81600888883 is a prime.

It is not a weakly prime, because it can be changed into another prime (81600881899) 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, 40800444449 + 40800444450.

It is an arithmetic number, because the mean of its divisors is an integer number (40800444450).

Almost surely, 2^81600888899 is an apocalyptic number.

81600888899 is a deficient number, since it is larger than the sum of its proper divisors (1).

81600888899 is an equidigital number, since it uses as much as digits as its factorization.

81600888899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15925248, while the sum is 65.

The spelling of 81600888899 in words is "eighty-one billion, six hundred million, eight hundred eighty-eight thousand, eight hundred ninety-nine".