165286640 has 20 divisors (see below), whose sum is σ = 384291624. Its totient is φ = 66114624.

The previous prime is 165286633. The next prime is 165286657. The reversal of 165286640 is 46682561.

165286640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 165286594 and 165286603.

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 in 3 ways as a sum of consecutive naturals, for example, 1032962 + ... + 1033121.

Almost surely, 2^165286640 is an apocalyptic number.

165286640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165286640 is an abundant number, since it is smaller than the sum of its proper divisors (219004984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165286640 is a wasteful number, since it uses less digits than its factorization.

165286640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066096 (or 2066090 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 165286640 is about 12856.3851840243. The cubic root of 165286640 is about 548.7980805833.

The spelling of 165286640 in words is "one hundred sixty-five million, two hundred eighty-six thousand, six hundred forty".