165563231620505 has 8 divisors (see below), whose sum is σ = 198679251002112. Its totient is φ = 132448336591408.

The previous prime is 165563231620463. The next prime is 165563231620513. The reversal of 165563231620505 is 505026132365561.

It is a happy number.

165563231620505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 165563231620505 - 2¹⁰ = 165563231619481 is a prime.

It is a super-2 number, since 2×165563231620505² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280764137 + ... + 281353206.

It is an arithmetic number, because the mean of its divisors is an integer number (24834906375264).

Almost surely, 2^{165563231620505} is an apocalyptic number.

It is an amenable number.

165563231620505 is a deficient number, since it is larger than the sum of its proper divisors (33116019381607).

165563231620505 is an equidigital number, since it uses as much as digits as its factorization.

165563231620505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562176255.

The product of its (nonzero) digits is 4860000, while the sum is 50.

The spelling of 165563231620505 in words is "one hundred sixty-five trillion, five hundred sixty-three billion, two hundred thirty-one million, six hundred twenty thousand, five hundred five".