1165520205049 has 16 divisors (see below), whose sum is σ = 1196938103760. Its totient is φ = 1134632632320.

The previous prime is 1165520205019. The next prime is 1165520205067. The reversal of 1165520205049 is 9405020255611.

It can be written as a sum of positive squares in 8 ways, for example, as 1510099600 + 1164010105449 = 38860^2 + 1078893^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165520205049 - 2³⁷ = 1028081251577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165520205019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1316409 + ... + 2015929.

It is an arithmetic number, because the mean of its divisors is an integer number (74808631485).

Almost surely, 2^{1165520205049} is an apocalyptic number.

It is an amenable number.

1165520205049 is a deficient number, since it is larger than the sum of its proper divisors (31417898711).

1165520205049 is an equidigital number, since it uses as much as digits as its factorization.

1165520205049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699900.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 1165520205049 in words is "one trillion, one hundred sixty-five billion, five hundred twenty million, two hundred five thousand, forty-nine".