165390445 has 16 divisors (see below), whose sum is σ = 217080000. Its totient is φ = 119968000.

The previous prime is 165390431. The next prime is 165390461. The reversal of 165390445 is 544093561.

It is not a de Polignac number, because 165390445 - 2⁷ = 165390317 is a prime.

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, 18306 + ... + 25804.

It is an arithmetic number, because the mean of its divisors is an integer number (13567500).

Almost surely, 2^165390445 is an apocalyptic number.

It is an amenable number.

165390445 is a deficient number, since it is larger than the sum of its proper divisors (51689555).

165390445 is a wasteful number, since it uses less digits than its factorization.

165390445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7916.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 165390445 is about 12860.4216493862. The cubic root of 165390445 is about 548.9129437951.

The spelling of 165390445 in words is "one hundred sixty-five million, three hundred ninety thousand, four hundred forty-five".