165650999 has 4 divisors (see below), whose sum is σ = 165677064. Its totient is φ = 165624936.

The previous prime is 165650993. The next prime is 165651041. The reversal of 165650999 is 999056561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 165650999 - 2⁸ = 165650743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165650993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3449 + ... + 18525.

It is an arithmetic number, because the mean of its divisors is an integer number (41419266).

Almost surely, 2^165650999 is an apocalyptic number.

165650999 is a deficient number, since it is larger than the sum of its proper divisors (26065).

165650999 is a wasteful number, since it uses less digits than its factorization.

165650999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26064.

The product of its (nonzero) digits is 656100, while the sum is 50.

The square root of 165650999 is about 12870.5477350422. The cubic root of 165650999 is about 549.2010427118.

The spelling of 165650999 in words is "one hundred sixty-five million, six hundred fifty thousand, nine hundred ninety-nine".