81877226149297 has 2 divisors, whose sum is σ = 81877226149298. Its totient is φ = 81877226149296.

The previous prime is 81877226149289. The next prime is 81877226149363. The reversal of 81877226149297 is 79294162277818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81792326175921 + 84899973376 = 9043911^2 + 291376^2 .

It is a cyclic number.

It is not a de Polignac number, because 81877226149297 - 2³ = 81877226149289 is a prime.

It is not a weakly prime, because it can be changed into another prime (81877226149207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40938613074648 + 40938613074649.

It is an arithmetic number, because the mean of its divisors is an integer number (40938613074649).

Almost surely, 2^{81877226149297} is an apocalyptic number.

It is an amenable number.

81877226149297 is a deficient number, since it is larger than the sum of its proper divisors (1).

81877226149297 is an equidigital number, since it uses as much as digits as its factorization.

81877226149297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 341397504, while the sum is 73.

The spelling of 81877226149297 in words is "eighty-one trillion, eight hundred seventy-seven billion, two hundred twenty-six million, one hundred forty-nine thousand, two hundred ninety-seven".