197840681086277 has 2 divisors, whose sum is σ = 197840681086278. Its totient is φ = 197840681086276.

The previous prime is 197840681086219. The next prime is 197840681086331. The reversal of 197840681086277 is 772680186048791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196247850304801 + 1592830781476 = 14008849^2 + 1262074^2 .

It is a cyclic number.

It is not a de Polignac number, because 197840681086277 - 2¹² = 197840681082181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197840681086577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98920340543138 + 98920340543139.

It is an arithmetic number, because the mean of its divisors is an integer number (98920340543139).

Almost surely, 2^{197840681086277} is an apocalyptic number.

It is an amenable number.

197840681086277 is a deficient number, since it is larger than the sum of its proper divisors (1).

197840681086277 is an equidigital number, since it uses as much as digits as its factorization.

197840681086277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 455196672, while the sum is 74.

The spelling of 197840681086277 in words is "one hundred ninety-seven trillion, eight hundred forty billion, six hundred eighty-one million, eighty-six thousand, two hundred seventy-seven".