165069945 has 12 divisors (see below), whose sum is σ = 286121316. Its totient is φ = 88037280.

The previous prime is 165069941. The next prime is 165069973. The reversal of 165069945 is 549960561.

It is a happy number.

165069945 is a `hidden beast` number, since 16 + 506 + 99 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 90782784 + 74287161 = 9528^2 + 8619^2 .

It is not a de Polignac number, because 165069945 - 2² = 165069941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 3668221 = 165069945 / (1 + 6 + 5 + 0 + 6 + 9 + 9 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 165069945.

It is not an unprimeable number, because it can be changed into a prime (165069941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1834066 + ... + 1834155.

It is an arithmetic number, because the mean of its divisors is an integer number (23843443).

Almost surely, 2^165069945 is an apocalyptic number.

165069945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165069945 is a deficient number, since it is larger than the sum of its proper divisors (121051371).

165069945 is a wasteful number, since it uses less digits than its factorization.

165069945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668232 (or 3668229 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 165069945 is about 12847.9548956244. The cubic root of 165069945 is about 548.5581462732.

The spelling of 165069945 in words is "one hundred sixty-five million, sixty-nine thousand, nine hundred forty-five".