165540570999 has 32 divisors (see below), whose sum is σ = 235320313536. Its totient is φ = 103152322560.

The previous prime is 165540570991. The next prime is 165540571039. The reversal of 165540570999 is 999075045561.

It is not a de Polignac number, because 165540570999 - 2³ = 165540570991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165540570991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5581389 + ... + 5610969.

It is an arithmetic number, because the mean of its divisors is an integer number (7353759798).

Almost surely, 2^165540570999 is an apocalyptic number.

165540570999 is a deficient number, since it is larger than the sum of its proper divisors (69779742537).

165540570999 is a wasteful number, since it uses less digits than its factorization.

165540570999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30355.

The product of its (nonzero) digits is 15309000, while the sum is 60.

The spelling of 165540570999 in words is "one hundred sixty-five billion, five hundred forty million, five hundred seventy thousand, nine hundred ninety-nine".