165941978 has 8 divisors (see below), whose sum is σ = 249451968. Its totient is φ = 82791324.

The previous prime is 165941957. The next prime is 165941989. The reversal of 165941978 is 879149561.

165941978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

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 in 3 ways as a sum of consecutive naturals, for example, 88676 + ... + 90527.

It is an arithmetic number, because the mean of its divisors is an integer number (31181496).

Almost surely, 2^165941978 is an apocalyptic number.

165941978 is a deficient number, since it is larger than the sum of its proper divisors (83509990).

165941978 is a wasteful number, since it uses less digits than its factorization.

165941978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179668.

The product of its digits is 544320, while the sum is 50.

The square root of 165941978 is about 12881.8468396422. The cubic root of 165941978 is about 549.5224262064.

The spelling of 165941978 in words is "one hundred sixty-five million, nine hundred forty-one thousand, nine hundred seventy-eight".