81116196319 has 2 divisors, whose sum is σ = 81116196320. Its totient is φ = 81116196318.

The previous prime is 81116196307. The next prime is 81116196331. The reversal of 81116196319 is 91369161118.

It is a balanced prime because it is at equal distance from previous prime (81116196307) and next prime (81116196331).

It is a cyclic number.

It is not a de Polignac number, because 81116196319 - 2⁷ = 81116196191 is a prime.

It is a super-2 number, since 2×81116196319² (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 (81116196019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40558098159 + 40558098160.

It is an arithmetic number, because the mean of its divisors is an integer number (40558098160).

Almost surely, 2^81116196319 is an apocalyptic number.

81116196319 is a deficient number, since it is larger than the sum of its proper divisors (1).

81116196319 is an equidigital number, since it uses as much as digits as its factorization.

81116196319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 46.

The spelling of 81116196319 in words is "eighty-one billion, one hundred sixteen million, one hundred ninety-six thousand, three hundred nineteen".