81607643119 has 2 divisors, whose sum is σ = 81607643120. Its totient is φ = 81607643118.

The previous prime is 81607643093. The next prime is 81607643137. The reversal of 81607643119 is 91134670618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81607643119 is a prime.

It is a super-2 number, since 2×81607643119² (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 (81607641119) 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, 40803821559 + 40803821560.

It is an arithmetic number, because the mean of its divisors is an integer number (40803821560).

Almost surely, 2^81607643119 is an apocalyptic number.

81607643119 is a deficient number, since it is larger than the sum of its proper divisors (1).

81607643119 is an equidigital number, since it uses as much as digits as its factorization.

81607643119 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 81607643119 in words is "eighty-one billion, six hundred seven million, six hundred forty-three thousand, one hundred nineteen".