565501166161 has 4 divisors (see below), whose sum is σ = 565655131492. Its totient is φ = 565347200832.

The previous prime is 565501166123. The next prime is 565501166227. The reversal of 565501166161 is 161661105565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157875102225 + 407626063936 = 397335^2 + 638456^2 .

It is a cyclic number.

It is not a de Polignac number, because 565501166161 - 2¹¹ = 565501164113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (565501166101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76977156 + ... + 76984501.

It is an arithmetic number, because the mean of its divisors is an integer number (141413782873).

Almost surely, 2^565501166161 is an apocalyptic number.

It is an amenable number.

565501166161 is a deficient number, since it is larger than the sum of its proper divisors (153965331).

565501166161 is a wasteful number, since it uses less digits than its factorization.

565501166161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153965330.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 565501166161 in words is "five hundred sixty-five billion, five hundred one million, one hundred sixty-six thousand, one hundred sixty-one".