165972198 has 16 divisors (see below), whose sum is σ = 379365120. Its totient is φ = 47420616.

The previous prime is 165972197. The next prime is 165972211. The reversal of 165972198 is 891279561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165972197) 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 7 ways as a sum of consecutive naturals, for example, 1975818 + ... + 1975901.

It is an arithmetic number, because the mean of its divisors is an integer number (23710320).

Almost surely, 2^165972198 is an apocalyptic number.

165972198 is an abundant number, since it is smaller than the sum of its proper divisors (213392922).

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

165972198 is a wasteful number, since it uses less digits than its factorization.

165972198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951731.

The product of its digits is 272160, while the sum is 48.

The square root of 165972198 is about 12883.0197547004. The cubic root of 165972198 is about 549.5557823629. Note that the first 3 decimals are identical.

The spelling of 165972198 in words is "one hundred sixty-five million, nine hundred seventy-two thousand, one hundred ninety-eight".