165944445 has 16 divisors (see below), whose sum is σ = 272688000. Its totient is φ = 86111424.

The previous prime is 165944437. The next prime is 165944453. The reversal of 165944445 is 544449561.

It is an interprime number because it is at equal distance from previous prime (165944437) and next prime (165944453).

It is not a de Polignac number, because 165944445 - 2³ = 165944437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165944397 and 165944406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148945 + ... + 150054.

It is an arithmetic number, because the mean of its divisors is an integer number (17043000).

Almost surely, 2^165944445 is an apocalyptic number.

165944445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165944445 is a deficient number, since it is larger than the sum of its proper divisors (106743555).

165944445 is a wasteful number, since it uses less digits than its factorization.

165944445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299044.

The product of its digits is 345600, while the sum is 42.

The square root of 165944445 is about 12881.9425941897. The cubic root of 165944445 is about 549.5251493773.

The spelling of 165944445 in words is "one hundred sixty-five million, nine hundred forty-four thousand, four hundred forty-five".