163101661 has 4 divisors (see below), whose sum is σ = 167509852. Its totient is φ = 158693472.

The previous prime is 163101611. The next prime is 163101677. The reversal of 163101661 is 166101361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166101361 = 1877 ⋅88493.

It can be written as a sum of positive squares in 2 ways, for example, as 87516025 + 75585636 = 9355^2 + 8694^2 .

It is a cyclic number.

It is not a de Polignac number, because 163101661 - 2¹¹ = 163099613 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 (163101611) 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, 2204040 + ... + 2204113.

It is an arithmetic number, because the mean of its divisors is an integer number (41877463).

Almost surely, 2^163101661 is an apocalyptic number.

It is an amenable number.

163101661 is a deficient number, since it is larger than the sum of its proper divisors (4408191).

163101661 is an equidigital number, since it uses as much as digits as its factorization.

163101661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4408190.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 163101661 is about 12771.1260662480. The cubic root of 163101661 is about 546.3690977113.

It can be divided in two parts, 16310 and 1661, that added together give a palindrome (17971).

The spelling of 163101661 in words is "one hundred sixty-three million, one hundred one thousand, six hundred sixty-one".