165566110550555 has 32 divisors (see below), whose sum is σ = 233582500847808. Its totient is φ = 111068791718400.

The previous prime is 165566110550543. The next prime is 165566110550611. The reversal of 165566110550555 is 555055011665561.

165566110550555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165566110550555 - 2²⁰ = 165566109501979 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 165566110550555.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82850744 + ... + 84825573.

It is an arithmetic number, because the mean of its divisors is an integer number (7299453151494).

Almost surely, 2^{165566110550555} is an apocalyptic number.

165566110550555 is a deficient number, since it is larger than the sum of its proper divisors (68016390297253).

165566110550555 is a wasteful number, since it uses less digits than its factorization.

165566110550555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167677727.

The product of its (nonzero) digits is 16875000, while the sum is 56.

The spelling of 165566110550555 in words is "one hundred sixty-five trillion, five hundred sixty-six billion, one hundred ten million, five hundred fifty thousand, five hundred fifty-five".