165474673181 has 4 divisors (see below), whose sum is σ = 165475707264. Its totient is φ = 165473639100.

The previous prime is 165474673123. The next prime is 165474673229. The reversal of 165474673181 is 181376474561.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 165474673181 - 2¹⁰ = 165474672157 is a prime.

It is a super-2 number, since 2×165474673181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165474673121) 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, 220205 + ... + 615986.

It is an arithmetic number, because the mean of its divisors is an integer number (41368926816).

Almost surely, 2^165474673181 is an apocalyptic number.

It is an amenable number.

165474673181 is a deficient number, since it is larger than the sum of its proper divisors (1034083).

165474673181 is an equidigital number, since it uses as much as digits as its factorization.

165474673181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034082.

The product of its digits is 3386880, while the sum is 53.

The spelling of 165474673181 in words is "one hundred sixty-five billion, four hundred seventy-four million, six hundred seventy-three thousand, one hundred eighty-one".