165139998 has 8 divisors (see below), whose sum is σ = 330280008. Its totient is φ = 55046664.

The previous prime is 165139987. The next prime is 165140011. The reversal of 165139998 is 899931561.

It is a happy number.

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

165139998 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165139998.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13761661 + ... + 13761672.

It is an arithmetic number, because the mean of its divisors is an integer number (41285001).

Almost surely, 2^165139998 is an apocalyptic number.

165139998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165139998 is a wasteful number, since it uses less digits than its factorization.

165139998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27523338.

The product of its digits is 524880, while the sum is 51.

The square root of 165139998 is about 12850.6808379945. The cubic root of 165139998 is about 548.6357350170.

The spelling of 165139998 in words is "one hundred sixty-five million, one hundred thirty-nine thousand, nine hundred ninety-eight".