165161561166559 has 8 divisors (see below), whose sum is σ = 165335628997728. Its totient is φ = 164987503599360.

The previous prime is 165161561166499. The next prime is 165161561166587. The reversal of 165161561166559 is 955661165161561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165161561166559 - 2⁷ = 165161561166431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165161561166559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165161561166059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29849374 + ... + 34947220.

It is an arithmetic number, because the mean of its divisors is an integer number (20666953624716).

Almost surely, 2^{165161561166559} is an apocalyptic number.

165161561166559 is a deficient number, since it is larger than the sum of its proper divisors (174067831169).

165161561166559 is an equidigital number, since it uses as much as digits as its factorization.

165161561166559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5131985.

The product of its digits is 43740000, while the sum is 64.

The spelling of 165161561166559 in words is "one hundred sixty-five trillion, one hundred sixty-one billion, five hundred sixty-one million, one hundred sixty-six thousand, five hundred fifty-nine".