163161661 has 8 divisors (see below), whose sum is σ = 176110200. Its totient is φ = 150269952.

The previous prime is 163161637. The next prime is 163161671. The reversal of 163161661 is 166161361.

It can be written as a sum of positive squares in 4 ways, for example, as 51753636 + 111408025 = 7194^2 + 10555^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163161661 - 2⁵ = 163161629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163161611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8140 + ... + 19813.

It is an arithmetic number, because the mean of its divisors is an integer number (22013775).

Almost surely, 2^163161661 is an apocalyptic number.

It is an amenable number.

163161661 is a deficient number, since it is larger than the sum of its proper divisors (12948539).

163161661 is a wasteful number, since it uses less digits than its factorization.

163161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28415.

The product of its digits is 3888, while the sum is 31.

The square root of 163161661 is about 12773.4748991807. The cubic root of 163161661 is about 546.4360868652.

The spelling of 163161661 in words is "one hundred sixty-three million, one hundred sixty-one thousand, six hundred sixty-one".