165447184813 has 4 divisors (see below), whose sum is σ = 165453882748. Its totient is φ = 165440486880.

The previous prime is 165447184783. The next prime is 165447184817. The reversal of 165447184813 is 318481744561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318481744561 = 355571 ⋅895691.

It can be written as a sum of positive squares in 2 ways, for example, as 83658620644 + 81788564169 = 289238^2 + 285987^2 .

It is a cyclic number.

It is not a de Polignac number, because 165447184813 - 2⁵ = 165447184781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165447184817) 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, 3311778 + ... + 3361363.

It is an arithmetic number, because the mean of its divisors is an integer number (41363470687).

Almost surely, 2^165447184813 is an apocalyptic number.

It is an amenable number.

165447184813 is a deficient number, since it is larger than the sum of its proper divisors (6697935).

165447184813 is an equidigital number, since it uses as much as digits as its factorization.

165447184813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6697934.

The product of its digits is 2580480, while the sum is 52.

The spelling of 165447184813 in words is "one hundred sixty-five billion, four hundred forty-seven million, one hundred eighty-four thousand, eight hundred thirteen".