165363363561 has 8 divisors (see below), whose sum is σ = 240528528864. Its totient is φ = 100220220320.

The previous prime is 165363363551. The next prime is 165363363619.

165363363561 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 165363363561 - 2¹⁸ = 165363101417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165363363561.

It is not an unprimeable number, because it can be changed into a prime (165363363551) 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, 2505505476 + ... + 2505505541.

It is an arithmetic number, because the mean of its divisors is an integer number (30066066108).

Almost surely, 2^165363363561 is an apocalyptic number.

165363363561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165363363561 is a deficient number, since it is larger than the sum of its proper divisors (75165165303).

165363363561 is a wasteful number, since it uses less digits than its factorization.

165363363561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011011031.

The product of its digits is 2624400, while the sum is 48.

The spelling of 165363363561 in words is "one hundred sixty-five billion, three hundred sixty-three million, three hundred sixty-three thousand, five hundred sixty-one".