165040613 has 4 divisors (see below), whose sum is σ = 165823008. Its totient is φ = 164258220.

The previous prime is 165040591. The next prime is 165040627. The reversal of 165040613 is 316040561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 316040561 = 3323 ⋅95107.

It is a cyclic number.

It is not a de Polignac number, because 165040613 - 2¹² = 165036517 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 (165040633) 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, 390881 + ... + 391302.

It is an arithmetic number, because the mean of its divisors is an integer number (41455752).

Almost surely, 2^165040613 is an apocalyptic number.

It is an amenable number.

165040613 is a deficient number, since it is larger than the sum of its proper divisors (782395).

165040613 is an equidigital number, since it uses as much as digits as its factorization.

165040613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782394.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 165040613 is about 12846.8133402801. The cubic root of 165040613 is about 548.5256524503.

The spelling of 165040613 in words is "one hundred sixty-five million, forty thousand, six hundred thirteen".