165433344161 has 4 divisors (see below), whose sum is σ = 165435214512. Its totient is φ = 165431473812.

The previous prime is 165433344157. The next prime is 165433344169. The reversal of 165433344161 is 161443334561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161443334561 = 379 ⋅425971859.

It is a cyclic number.

It is not a de Polignac number, because 165433344161 - 2² = 165433344157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165433344169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 795551 + ... + 981716.

It is an arithmetic number, because the mean of its divisors is an integer number (41358803628).

Almost surely, 2^165433344161 is an apocalyptic number.

It is an amenable number.

165433344161 is a deficient number, since it is larger than the sum of its proper divisors (1870351).

165433344161 is an equidigital number, since it uses as much as digits as its factorization.

165433344161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870350.

The product of its digits is 311040, while the sum is 41.

The spelling of 165433344161 in words is "one hundred sixty-five billion, four hundred thirty-three million, three hundred forty-four thousand, one hundred sixty-one".