165231680 has 28 divisors (see below), whose sum is σ = 393458700. Its totient is φ = 66092544.

The previous prime is 165231659. The next prime is 165231709. The reversal of 165231680 is 86132561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 91546624 + 73685056 = 9568^2 + 8584^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257855 + ... + 258494.

Almost surely, 2^165231680 is an apocalyptic number.

165231680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165231680 is an abundant number, since it is smaller than the sum of its proper divisors (228227020).

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

165231680 is an equidigital number, since it uses as much as digits as its factorization.

165231680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516366 (or 516356 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 165231680 is about 12854.2475470173. The cubic root of 165231680 is about 548.7372462932.

The spelling of 165231680 in words is "one hundred sixty-five million, two hundred thirty-one thousand, six hundred eighty".