1165520205055 has 4 divisors (see below), whose sum is σ = 1398624246072. Its totient is φ = 932416164040.

The previous prime is 1165520205019. The next prime is 1165520205067. The reversal of 1165520205055 is 5505020255611.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1165520205055 - 2²⁵ = 1165486650623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116552020501 + ... + 116552020510.

It is an arithmetic number, because the mean of its divisors is an integer number (349656061518).

Almost surely, 2^{1165520205055} is an apocalyptic number.

1165520205055 is a deficient number, since it is larger than the sum of its proper divisors (233104041017).

1165520205055 is an equidigital number, since it uses as much as digits as its factorization.

1165520205055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233104041016.

The product of its (nonzero) digits is 75000, while the sum is 37.

The spelling of 1165520205055 in words is "one trillion, one hundred sixty-five billion, five hundred twenty million, two hundred five thousand, fifty-five".