4020202161 has 6 divisors (see below), whose sum is σ = 5806958690. Its totient is φ = 2680134768.

The previous prime is 4020202157. The next prime is 4020202183. The reversal of 4020202161 is 1612020204.

4020202161 is a `hidden beast` number, since 402 + 0 + 202 + 1 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3291202161 + 729000000 = 57369^2 + 27000^2 .

It is not a de Polignac number, because 4020202161 - 2² = 4020202157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020202141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223344556 + ... + 223344573.

Almost surely, 2^4020202161 is an apocalyptic number.

It is an amenable number.

4020202161 is a deficient number, since it is larger than the sum of its proper divisors (1786756529).

4020202161 is a wasteful number, since it uses less digits than its factorization.

4020202161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446689135 (or 446689132 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4020202161 is about 63405.0641589455. The cubic root of 4020202161 is about 1590.0689764784.

Adding to 4020202161 its reverse (1612020204), we get a palindrome (5632222365).

The spelling of 4020202161 in words is "four billion, twenty million, two hundred two thousand, one hundred sixty-one".