165671998 has 16 divisors (see below), whose sum is σ = 259024896. Its totient is φ = 79382520.

The previous prime is 165671959. The next prime is 165671999. The reversal of 165671998 is 899176561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165671999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6586 + ... + 19357.

It is an arithmetic number, because the mean of its divisors is an integer number (16189056).

Almost surely, 2^165671998 is an apocalyptic number.

165671998 is a deficient number, since it is larger than the sum of its proper divisors (93352898).

165671998 is a wasteful number, since it uses less digits than its factorization.

165671998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26079.

The product of its digits is 816480, while the sum is 52.

The square root of 165671998 is about 12871.3634864376. The cubic root of 165671998 is about 549.2242484988.

The spelling of 165671998 in words is "one hundred sixty-five million, six hundred seventy-one thousand, nine hundred ninety-eight".