165988887 has 8 divisors (see below), whose sum is σ = 221988480. Its totient is φ = 110324280.

The previous prime is 165988859. The next prime is 165988897. The reversal of 165988887 is 788889561.

165988887 is digitally balanced in base 2, 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 not a de Polignac number, because 165988887 - 2⁷ = 165988759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165988887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165988817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82587 + ... + 84572.

It is an arithmetic number, because the mean of its divisors is an integer number (27748560).

Almost surely, 2^165988887 is an apocalyptic number.

165988887 is a deficient number, since it is larger than the sum of its proper divisors (55999593).

165988887 is a wasteful number, since it uses less digits than its factorization.

165988887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167493.

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

The square root of 165988887 is about 12883.6674514674. The cubic root of 165988887 is about 549.5742015704.

The spelling of 165988887 in words is "one hundred sixty-five million, nine hundred eighty-eight thousand, eight hundred eighty-seven".