165667715 has 16 divisors (see below), whose sum is σ = 205338240. Its totient is φ = 128256832.

The previous prime is 165667681. The next prime is 165667721. The reversal of 165667715 is 517766561.

It is not a de Polignac number, because 165667715 - 2¹⁸ = 165405571 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1861391 + ... + 1861479.

It is an arithmetic number, because the mean of its divisors is an integer number (12833640).

Almost surely, 2^165667715 is an apocalyptic number.

165667715 is a deficient number, since it is larger than the sum of its proper divisors (39670525).

165667715 is an frugal number, since it uses more digits than its factorization.

165667715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 141 counting only the distinct ones).

The product of its digits is 264600, while the sum is 44.

The square root of 165667715 is about 12871.1971082724. The cubic root of 165667715 is about 549.2195155571.

The spelling of 165667715 in words is "one hundred sixty-five million, six hundred sixty-seven thousand, seven hundred fifteen".