165043260621540 has 144 divisors (see below), whose sum is σ = 572300830378368. Its totient is φ = 37714227028992.

The previous prime is 165043260621529. The next prime is 165043260621557. The reversal of 165043260621540 is 45126062340561.

165043260621540 is a `hidden beast` number, since 1 + 6 + 5 + 0 + 4 + 32 + 606 + 2 + 1 + 5 + 4 + 0 = 666.

It is a super-2 number, since 2×165043260621540² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12487722 + ... + 22046081.

It is an arithmetic number, because the mean of its divisors is an integer number (3974311322072).

Almost surely, 2^{165043260621540} is an apocalyptic number.

165043260621540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165043260621540 is an abundant number, since it is smaller than the sum of its proper divisors (407257569756828).

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

165043260621540 is a wasteful number, since it uses less digits than its factorization.

165043260621540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34537618 (or 34537613 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 165043260621540 in words is "one hundred sixty-five trillion, forty-three billion, two hundred sixty million, six hundred twenty-one thousand, five hundred forty".