165878993 has 8 divisors (see below), whose sum is σ = 193985088. Its totient is φ = 138875184.

The previous prime is 165878983. The next prime is 165879011. The reversal of 165878993 is 399878561.

165878993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-165878993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165878953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275246 + ... + 275847.

It is an arithmetic number, because the mean of its divisors is an integer number (24248136).

Almost surely, 2^165878993 is an apocalyptic number.

It is an amenable number.

165878993 is a deficient number, since it is larger than the sum of its proper divisors (28106095).

165878993 is an equidigital number, since it uses as much as digits as its factorization.

165878993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551143.

The product of its digits is 3265920, while the sum is 56.

The square root of 165878993 is about 12879.4018882866. The cubic root of 165878993 is about 549.4528917614.

The spelling of 165878993 in words is "one hundred sixty-five million, eight hundred seventy-eight thousand, nine hundred ninety-three".