81097374118361 has 2 divisors, whose sum is σ = 81097374118362. Its totient is φ = 81097374118360.

The previous prime is 81097374118357. The next prime is 81097374118379. The reversal of 81097374118361 is 16381147379018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42988741296400 + 38108632821961 = 6556580^2 + 6173219^2 .

It is a cyclic number.

It is not a de Polignac number, because 81097374118361 - 2² = 81097374118357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81097374118361.

It is not a weakly prime, because it can be changed into another prime (81097374118661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40548687059180 + 40548687059181.

It is an arithmetic number, because the mean of its divisors is an integer number (40548687059181).

Almost surely, 2^{81097374118361} is an apocalyptic number.

It is an amenable number.

81097374118361 is a deficient number, since it is larger than the sum of its proper divisors (1).

81097374118361 is an equidigital number, since it uses as much as digits as its factorization.

81097374118361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 81097374118361 in words is "eighty-one trillion, ninety-seven billion, three hundred seventy-four million, one hundred eighteen thousand, three hundred sixty-one".