165380520 has 64 divisors (see below), whose sum is σ = 497067840. Its totient is φ = 44019200.

The previous prime is 165380507. The next prime is 165380521. The reversal of 165380520 is 25083561.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (165380521) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 90415 + ... + 92225.

It is an arithmetic number, because the mean of its divisors is an integer number (7766685).

Almost surely, 2^165380520 is an apocalyptic number.

165380520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165380520 is an abundant number, since it is smaller than the sum of its proper divisors (331687320).

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

165380520 is a wasteful number, since it uses less digits than its factorization.

165380520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586 (or 2582 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 165380520 is about 12860.0357697792. The cubic root of 165380520 is about 548.9019635761.

The spelling of 165380520 in words is "one hundred sixty-five million, three hundred eighty thousand, five hundred twenty".