165878164 has 6 divisors (see below), whose sum is σ = 290286794. Its totient is φ = 82939080.

The previous prime is 165878159. The next prime is 165878177. The reversal of 165878164 is 461878561.

It can be written as a sum of positive squares in only one way, i.e., 161290000 + 4588164 = 12700^2 + 2142^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20734767 + ... + 20734774.

Almost surely, 2^165878164 is an apocalyptic number.

It is an amenable number.

165878164 is a deficient number, since it is larger than the sum of its proper divisors (124408630).

165878164 is a wasteful number, since it uses less digits than its factorization.

165878164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41469545 (or 41469543 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 165878164 is about 12879.3697050749. The cubic root of 165878164 is about 549.4519764412.

The spelling of 165878164 in words is "one hundred sixty-five million, eight hundred seventy-eight thousand, one hundred sixty-four".