165689320 has 32 divisors (see below), whose sum is σ = 381474720. Its totient is φ = 64733760.

The previous prime is 165689317. The next prime is 165689333. The reversal of 165689320 is 23986561.

165689320 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46446 + ... + 49885.

It is an arithmetic number, because the mean of its divisors is an integer number (11921085).

Almost surely, 2^165689320 is an apocalyptic number.

165689320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165689320 is an abundant number, since it is smaller than the sum of its proper divisors (215785400).

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

165689320 is a wasteful number, since it uses less digits than its factorization.

165689320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96385 (or 96381 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 165689320 is about 12872.0363579350. The cubic root of 165689320 is about 549.2433893937.

The spelling of 165689320 in words is "one hundred sixty-five million, six hundred eighty-nine thousand, three hundred twenty".