165998345 has 16 divisors (see below), whose sum is σ = 210000000. Its totient is φ = 125618688.

The previous prime is 165998341. The next prime is 165998347. The reversal of 165998345 is 543899561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 165998345 - 2² = 165998341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165998293 and 165998302.

It is not an unprimeable number, because it can be changed into a prime (165998341) 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, 117956 + ... + 119354.

It is an arithmetic number, because the mean of its divisors is an integer number (13125000).

Almost surely, 2^165998345 is an apocalyptic number.

It is an amenable number.

165998345 is a deficient number, since it is larger than the sum of its proper divisors (44001655).

165998345 is a wasteful number, since it uses less digits than its factorization.

165998345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672.

The product of its digits is 1166400, while the sum is 50.

The square root of 165998345 is about 12884.0345001090. The cubic root of 165998345 is about 549.5846395665.

The spelling of 165998345 in words is "one hundred sixty-five million, nine hundred ninety-eight thousand, three hundred forty-five".