165740945 has 16 divisors (see below), whose sum is σ = 211314960. Its totient is φ = 124556544.

The previous prime is 165740881. The next prime is 165740947. The reversal of 165740945 is 549047561.

It can be written as a sum of positive squares in 8 ways, for example, as 1926544 + 163814401 = 1388^2 + 12799^2 .

It is a cyclic number.

It is not a de Polignac number, because 165740945 - 2⁶ = 165740881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165740947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10082 + ... + 20811.

It is an arithmetic number, because the mean of its divisors is an integer number (13207185).

Almost surely, 2^165740945 is an apocalyptic number.

It is an amenable number.

165740945 is a deficient number, since it is larger than the sum of its proper divisors (45574015).

165740945 is a wasteful number, since it uses less digits than its factorization.

165740945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30964.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 165740945 is about 12874.0415177208. The cubic root of 165740945 is about 549.3004273601.

The spelling of 165740945 in words is "one hundred sixty-five million, seven hundred forty thousand, nine hundred forty-five".