165986445 has 16 divisors (see below), whose sum is σ = 265744512. Its totient is φ = 88470720.

The previous prime is 165986441. The next prime is 165986473. The reversal of 165986445 is 544689561.

It is not a de Polignac number, because 165986445 - 2² = 165986441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165986394 and 165986403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165986441) 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, 35335 + ... + 39755.

It is an arithmetic number, because the mean of its divisors is an integer number (16609032).

Almost surely, 2^165986445 is an apocalyptic number.

165986445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165986445 is a deficient number, since it is larger than the sum of its proper divisors (99758067).

165986445 is a wasteful number, since it uses less digits than its factorization.

165986445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6932.

The product of its digits is 1036800, while the sum is 48.

The square root of 165986445 is about 12883.5726799673. The cubic root of 165986445 is about 549.5715064767.

The spelling of 165986445 in words is "one hundred sixty-five million, nine hundred eighty-six thousand, four hundred forty-five".