165878051 has 4 divisors (see below), whose sum is σ = 167588232. Its totient is φ = 164167872.

The previous prime is 165878039. The next prime is 165878071. The reversal of 165878051 is 150878561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150878561 = 29 ⋅5202709.

It is a cyclic number.

It is not a de Polignac number, because 165878051 - 2¹⁸ = 165615907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165878071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854945 + ... + 855138.

It is an arithmetic number, because the mean of its divisors is an integer number (41897058).

Almost surely, 2^165878051 is an apocalyptic number.

165878051 is a deficient number, since it is larger than the sum of its proper divisors (1710181).

165878051 is an equidigital number, since it uses as much as digits as its factorization.

165878051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710180.

The product of its (nonzero) digits is 67200, while the sum is 41.

The square root of 165878051 is about 12879.3653182135. The cubic root of 165878051 is about 549.4518516747.

The spelling of 165878051 in words is "one hundred sixty-five million, eight hundred seventy-eight thousand, fifty-one".