165440443530 has 64 divisors (see below), whose sum is σ = 398300872320. Its totient is φ = 43979384064.

The previous prime is 165440443489. The next prime is 165440443537. The reversal of 165440443530 is 35344044561.

It is not an unprimeable number, because it can be changed into a prime (165440443537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31588072 + ... + 31593308.

It is an arithmetic number, because the mean of its divisors is an integer number (6223451130).

Almost surely, 2^165440443530 is an apocalyptic number.

165440443530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165440443530 is an abundant number, since it is smaller than the sum of its proper divisors (232860428790).

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

165440443530 is a wasteful number, since it uses less digits than its factorization.

165440443530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8343.

The product of its (nonzero) digits is 345600, while the sum is 39.

The spelling of 165440443530 in words is "one hundred sixty-five billion, four hundred forty million, four hundred forty-three thousand, five hundred thirty".