165566500655105 has 32 divisors (see below), whose sum is σ = 217794064982400. Its totient is φ = 119827430553600.

The previous prime is 165566500655093. The next prime is 165566500655107. The reversal of 165566500655105 is 501556005665561.

It is not a de Polignac number, because 165566500655105 - 2¹⁰ = 165566500654081 is a prime.

It is a super-2 number, since 2×165566500655105² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165566500655107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99780881 + ... + 101426609.

It is an arithmetic number, because the mean of its divisors is an integer number (6806064530700).

Almost surely, 2^{165566500655105} is an apocalyptic number.

It is an amenable number.

165566500655105 is a deficient number, since it is larger than the sum of its proper divisors (52227564327295).

165566500655105 is a wasteful number, since it uses less digits than its factorization.

165566500655105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654625.

The product of its (nonzero) digits is 20250000, while the sum is 56.

The spelling of 165566500655105 in words is "one hundred sixty-five trillion, five hundred sixty-six billion, five hundred million, six hundred fifty-five thousand, one hundred five".