165307445 has 4 divisors (see below), whose sum is σ = 198368940. Its totient is φ = 132245952.

The previous prime is 165307399. The next prime is 165307451. The reversal of 165307445 is 544703561.

165307445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544703561 = 2069 ⋅263269.

It can be written as a sum of positive squares in 2 ways, for example, as 101163364 + 64144081 = 10058^2 + 8009^2 .

It is a cyclic number.

It is not a de Polignac number, because 165307445 - 2²⁰ = 164258869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16530740 + ... + 16530749.

It is an arithmetic number, because the mean of its divisors is an integer number (49592235).

Almost surely, 2^165307445 is an apocalyptic number.

It is an amenable number.

165307445 is a deficient number, since it is larger than the sum of its proper divisors (33061495).

165307445 is an equidigital number, since it uses as much as digits as its factorization.

165307445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33061494.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 165307445 is about 12857.1942895797. The cubic root of 165307445 is about 548.8211057656.

The spelling of 165307445 in words is "one hundred sixty-five million, three hundred seven thousand, four hundred forty-five".