81116864603 has 2 divisors, whose sum is σ = 81116864604. Its totient is φ = 81116864602.

The previous prime is 81116864599. The next prime is 81116864657. The reversal of 81116864603 is 30646861118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81116864603 - 2² = 81116864599 is a prime.

It is not a weakly prime, because it can be changed into another prime (81116864683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40558432301 + 40558432302.

It is an arithmetic number, because the mean of its divisors is an integer number (40558432302).

Almost surely, 2^81116864603 is an apocalyptic number.

81116864603 is a deficient number, since it is larger than the sum of its proper divisors (1).

81116864603 is an equidigital number, since it uses as much as digits as its factorization.

81116864603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 81116864603 in words is "eighty-one billion, one hundred sixteen million, eight hundred sixty-four thousand, six hundred three".