1165501661449 has 2 divisors, whose sum is σ = 1165501661450. Its totient is φ = 1165501661448.

The previous prime is 1165501661419. The next prime is 1165501661473. The reversal of 1165501661449 is 9441661055611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 742644085824 + 422857575625 = 861768^2 + 650275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165501661449 - 2⁹ = 1165501660937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165501661419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582750830724 + 582750830725.

It is an arithmetic number, because the mean of its divisors is an integer number (582750830725).

Almost surely, 2^{1165501661449} is an apocalyptic number.

It is an amenable number.

1165501661449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165501661449 is an equidigital number, since it uses as much as digits as its factorization.

1165501661449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 1165501661449 in words is "one trillion, one hundred sixty-five billion, five hundred one million, six hundred sixty-one thousand, four hundred forty-nine".