213816169161 has 36 divisors (see below), whose sum is σ = 365159052804. Its totient is φ = 120177691200.

The previous prime is 213816169159. The next prime is 213816169201. The reversal of 213816169161 is 161961618312.

213816169161 is a `hidden beast` number, since 2 + 13 + 8 + 1 + 616 + 9 + 16 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 85992043536 + 127824125625 = 293244^2 + 357525^2 .

It is not a de Polignac number, because 213816169161 - 2¹ = 213816169159 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213816669161) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3947230 + ... + 4001031.

Almost surely, 2^213816169161 is an apocalyptic number.

213816169161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213816169161 is a deficient number, since it is larger than the sum of its proper divisors (151342883643).

213816169161 is a wasteful number, since it uses less digits than its factorization.

213816169161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948342 (or 7948332 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The spelling of 213816169161 in words is "two hundred thirteen billion, eight hundred sixteen million, one hundred sixty-nine thousand, one hundred sixty-one".