165199518 has 24 divisors (see below), whose sum is σ = 390472056. Its totient is φ = 50060400.

The previous prime is 165199483. The next prime is 165199519. The reversal of 165199518 is 815991561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165199519) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 416973 + ... + 417368.

It is an arithmetic number, because the mean of its divisors is an integer number (16269669).

Almost surely, 2^165199518 is an apocalyptic number.

165199518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165199518 is an abundant number, since it is smaller than the sum of its proper divisors (225272538).

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

165199518 is a wasteful number, since it uses less digits than its factorization.

165199518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834360 (or 834357 counting only the distinct ones).

The product of its digits is 97200, while the sum is 45.

The square root of 165199518 is about 12852.9964599699. The cubic root of 165199518 is about 548.7016404648.

The spelling of 165199518 in words is "one hundred sixty-five million, one hundred ninety-nine thousand, five hundred eighteen".