163531166065 has 16 divisors (see below), whose sum is σ = 201682475280. Its totient is φ = 127199842560.

The previous prime is 163531166033. The next prime is 163531166087. The reversal of 163531166065 is 560661135361.

It can be written as a sum of positive squares in 8 ways, for example, as 2217279744 + 161313886321 = 47088^2 + 401639^2 .

It is not a de Polignac number, because 163531166065 - 2⁵ = 163531166033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44926 + ... + 573655.

It is an arithmetic number, because the mean of its divisors is an integer number (12605154705).

Almost surely, 2^163531166065 is an apocalyptic number.

It is an amenable number.

163531166065 is a deficient number, since it is larger than the sum of its proper divisors (38151309215).

163531166065 is a wasteful number, since it uses less digits than its factorization.

163531166065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620052.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 163531166065 in words is "one hundred sixty-three billion, five hundred thirty-one million, one hundred sixty-six thousand, sixty-five".