165131280440 has 32 divisors (see below), whose sum is σ = 424623293280. Its totient is φ = 56616438912.

The previous prime is 165131280421. The next prime is 165131280499. The reversal of 165131280440 is 44082131561.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 165131280440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294877007 + ... + 294877566.

It is an arithmetic number, because the mean of its divisors is an integer number (13269477915).

Almost surely, 2^165131280440 is an apocalyptic number.

165131280440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165131280440 is an abundant number, since it is smaller than the sum of its proper divisors (259492012840).

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

165131280440 is a wasteful number, since it uses less digits than its factorization.

165131280440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589754591 (or 589754587 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 165131280440 in words is "one hundred sixty-five billion, one hundred thirty-one million, two hundred eighty thousand, four hundred forty".