165000166609 has 4 divisors (see below), whose sum is σ = 165093021604. Its totient is φ = 164907311616.

The previous prime is 165000166607. The next prime is 165000166613. The reversal of 165000166609 is 906661000561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906661000561 = 17 ⋅53333000033.

It can be written as a sum of positive squares in 2 ways, for example, as 37816636225 + 127183530384 = 194465^2 + 356628^2 .

It is a cyclic number.

It is not a de Polignac number, because 165000166609 - 2¹ = 165000166607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165000166607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46424832 + ... + 46428385.

It is an arithmetic number, because the mean of its divisors is an integer number (41273255401).

Almost surely, 2^165000166609 is an apocalyptic number.

It is an amenable number.

165000166609 is a deficient number, since it is larger than the sum of its proper divisors (92854995).

165000166609 is an equidigital number, since it uses as much as digits as its factorization.

165000166609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92854994.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 165000166609 in words is "one hundred sixty-five billion, one hundred sixty-six thousand, six hundred nine".