165194145 has 12 divisors (see below), whose sum is σ = 286336596. Its totient is φ = 88103520.

The previous prime is 165194129. The next prime is 165194147. The reversal of 165194145 is 541491561.

It can be written as a sum of positive squares in 2 ways, for example, as 63345681 + 101848464 = 7959^2 + 10092^2 .

It is not a de Polignac number, because 165194145 - 2⁴ = 165194129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165194147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1835446 + ... + 1835535.

It is an arithmetic number, because the mean of its divisors is an integer number (23861383).

Almost surely, 2^165194145 is an apocalyptic number.

165194145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165194145 is a deficient number, since it is larger than the sum of its proper divisors (121142451).

165194145 is a wasteful number, since it uses less digits than its factorization.

165194145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670992 (or 3670989 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 165194145 is about 12852.7874408628. The cubic root of 165194145 is about 548.6956916866.

The spelling of 165194145 in words is "one hundred sixty-five million, one hundred ninety-four thousand, one hundred forty-five".