165516556606505 has 64 divisors (see below), whose sum is σ = 215597828355840. Its totient is φ = 121259989453824.

The previous prime is 165516556606493. The next prime is 165516556606507. The reversal of 165516556606505 is 505606655615561.

It is not a de Polignac number, because 165516556606505 - 2¹⁰ = 165516556605481 is a prime.

It is a super-2 number, since 2×165516556606505² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165516556606507) 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 63 ways as a sum of consecutive naturals, for example, 9743710622 + ... + 9743727608.

It is an arithmetic number, because the mean of its divisors is an integer number (3368716068060).

Almost surely, 2^{165516556606505} is an apocalyptic number.

It is an amenable number.

165516556606505 is a deficient number, since it is larger than the sum of its proper divisors (50081271749335).

165516556606505 is a wasteful number, since it uses less digits than its factorization.

165516556606505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19098.

The product of its (nonzero) digits is 121500000, while the sum is 62.

The spelling of 165516556606505 in words is "one hundred sixty-five trillion, five hundred sixteen billion, five hundred fifty-six million, six hundred six thousand, five hundred five".