165181923 has 32 divisors (see below), whose sum is σ = 253163520. Its totient is φ = 107711208.

The previous prime is 165181897. The next prime is 165181943. The reversal of 165181923 is 329181561.

It is not a de Polignac number, because 165181923 - 2⁹ = 165181411 is a prime.

It is a super-3 number, since 3×165181923³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (165181943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101986 + ... + 103592.

It is an arithmetic number, because the mean of its divisors is an integer number (7911360).

Almost surely, 2^165181923 is an apocalyptic number.

165181923 is a deficient number, since it is larger than the sum of its proper divisors (87981597).

165181923 is an frugal number, since it uses more digits than its factorization.

165181923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675 (or 1657 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 165181923 is about 12852.3119710035. The cubic root of 165181923 is about 548.6821594796.

The spelling of 165181923 in words is "one hundred sixty-five million, one hundred eighty-one thousand, nine hundred twenty-three".