165166550113 has 4 divisors (see below), whose sum is σ = 167429105668. Its totient is φ = 162903994560.

The previous prime is 165166550111. The next prime is 165166550239. The reversal of 165166550113 is 311055661561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 58843600929 + 106322949184 = 242577^2 + 326072^2 .

It is a cyclic number.

It is not a de Polignac number, because 165166550113 - 2¹ = 165166550111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165166550111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131277668 + ... + 1131277813.

It is an arithmetic number, because the mean of its divisors is an integer number (41857276417).

Almost surely, 2^165166550113 is an apocalyptic number.

It is an amenable number.

165166550113 is a deficient number, since it is larger than the sum of its proper divisors (2262555555).

165166550113 is an equidigital number, since it uses as much as digits as its factorization.

165166550113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262555554.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 165166550113 in words is "one hundred sixty-five billion, one hundred sixty-six million, five hundred fifty thousand, one hundred thirteen".