165878413 has 4 divisors (see below), whose sum is σ = 166149628. Its totient is φ = 165607200.

The previous prime is 165878407. The next prime is 165878429. The reversal of 165878413 is 314878561.

165878413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 44063044 + 121815369 = 6638^2 + 11037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165878413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165878413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165878443) 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, 134688 + ... + 135913.

It is an arithmetic number, because the mean of its divisors is an integer number (41537407).

Almost surely, 2^165878413 is an apocalyptic number.

It is an amenable number.

165878413 is a deficient number, since it is larger than the sum of its proper divisors (271215).

165878413 is an equidigital number, since it uses as much as digits as its factorization.

165878413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271214.

The product of its digits is 161280, while the sum is 43.

The square root of 165878413 is about 12879.3793716933. The cubic root of 165878413 is about 549.4522513688.

The spelling of 165878413 in words is "one hundred sixty-five million, eight hundred seventy-eight thousand, four hundred thirteen".