165888987 has 16 divisors (see below), whose sum is σ = 242515200. Its totient is φ = 100029600.

The previous prime is 165888973. The next prime is 165889007. The reversal of 165888987 is 789888561.

It is not a de Polignac number, because 165888987 - 2⁴ = 165888971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165888987.

It is not an unprimeable number, because it can be changed into a prime (165888917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6064 + ... + 19197.

It is an arithmetic number, because the mean of its divisors is an integer number (15157200).

Almost surely, 2^165888987 is an apocalyptic number.

165888987 is a deficient number, since it is larger than the sum of its proper divisors (76626213).

165888987 is a wasteful number, since it uses less digits than its factorization.

165888987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25474.

The product of its digits is 7741440, while the sum is 60.

The square root of 165888987 is about 12879.7898662983. The cubic root of 165888987 is about 549.4639261543.

The spelling of 165888987 in words is "one hundred sixty-five million, eight hundred eighty-eight thousand, nine hundred eighty-seven".