165928545 has 12 divisors (see below), whose sum is σ = 287609556. Its totient is φ = 88495200.

The previous prime is 165928493. The next prime is 165928547. The reversal of 165928545 is 545829561.

165928545 = 2466² + 2467² + ... + 2492².

165928545 is a `hidden beast` number, since 1 + 6 + 592 + 8 + 54 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 71216721 + 94711824 = 8439^2 + 9732^2 .

It is not a de Polignac number, because 165928545 - 2⁹ = 165928033 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: 3687301 = 165928545 / (1 + 6 + 5 + 9 + 2 + 8 + 5 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 165928545.

It is not an unprimeable number, because it can be changed into a prime (165928547) 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, 1843606 + ... + 1843695.

It is an arithmetic number, because the mean of its divisors is an integer number (23967463).

Almost surely, 2^165928545 is an apocalyptic number.

165928545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165928545 is a deficient number, since it is larger than the sum of its proper divisors (121681011).

165928545 is a wasteful number, since it uses less digits than its factorization.

165928545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687312 (or 3687309 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 165928545 is about 12881.3254364603. The cubic root of 165928545 is about 549.5075978629.

The spelling of 165928545 in words is "one hundred sixty-five million, nine hundred twenty-eight thousand, five hundred forty-five".