165654613 has 4 divisors (see below), whose sum is σ = 175399020. Its totient is φ = 155910208.

The previous prime is 165654571. The next prime is 165654617. The reversal of 165654613 is 316456561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85784644 + 79869969 = 9262^2 + 8937^2 .

It is a cyclic number.

It is not a de Polignac number, because 165654613 - 2¹⁷ = 165523541 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 (165654617) 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, 4872178 + ... + 4872211.

It is an arithmetic number, because the mean of its divisors is an integer number (43849755).

Almost surely, 2^165654613 is an apocalyptic number.

It is an amenable number.

165654613 is a deficient number, since it is larger than the sum of its proper divisors (9744407).

165654613 is an equidigital number, since it uses as much as digits as its factorization.

165654613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9744406.

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

The square root of 165654613 is about 12870.6881323416. The cubic root of 165654613 is about 549.2050366471.

The spelling of 165654613 in words is "one hundred sixty-five million, six hundred fifty-four thousand, six hundred thirteen".