1165261787171 has 2 divisors, whose sum is σ = 1165261787172. Its totient is φ = 1165261787170.

The previous prime is 1165261787167. The next prime is 1165261787227. The reversal of 1165261787171 is 1717871625611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1165261787171 - 2² = 1165261787167 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165261787101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582630893585 + 582630893586.

It is an arithmetic number, because the mean of its divisors is an integer number (582630893586).

Almost surely, 2^{1165261787171} is an apocalyptic number.

1165261787171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165261787171 is an equidigital number, since it uses as much as digits as its factorization.

1165261787171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 53.

The spelling of 1165261787171 in words is "one trillion, one hundred sixty-five billion, two hundred sixty-one million, seven hundred eighty-seven thousand, one hundred seventy-one".