165015610161 has 4 divisors (see below), whose sum is σ = 220020813552. Its totient is φ = 110010406772.

The previous prime is 165015610117. The next prime is 165015610171. The reversal of 165015610161 is 161016510561.

165015610161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165015610161 - 2¹⁰ = 165015609137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165015610171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27502601691 + ... + 27502601696.

It is an arithmetic number, because the mean of its divisors is an integer number (55005203388).

Almost surely, 2^165015610161 is an apocalyptic number.

It is an amenable number.

165015610161 is a deficient number, since it is larger than the sum of its proper divisors (55005203391).

165015610161 is an equidigital number, since it uses as much as digits as its factorization.

165015610161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55005203390.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 165015610161 in words is "one hundred sixty-five billion, fifteen million, six hundred ten thousand, one hundred sixty-one".