19969633161 has 10 divisors (see below), whose sum is σ = 29831180522. Its totient is φ = 13313088720.

The previous prime is 19969633157. The next prime is 19969633223. The reversal of 19969633161 is 16133696991.

19969633161 is a `hidden beast` number, since 199 + 69 + 6 + 331 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18115814025 + 1853819136 = 134595^2 + 43056^2 .

It is not a de Polignac number, because 19969633161 - 2² = 19969633157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19969633098 and 19969633107.

It is not an unprimeable number, because it can be changed into a prime (19969633111) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 123269260 + ... + 123269421.

Almost surely, 2^19969633161 is an apocalyptic number.

It is an amenable number.

19969633161 is a deficient number, since it is larger than the sum of its proper divisors (9861547361).

19969633161 is an equidigital number, since it uses as much as digits as its factorization.

19969633161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246538693 (or 246538684 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The spelling of 19969633161 in words is "nineteen billion, nine hundred sixty-nine million, six hundred thirty-three thousand, one hundred sixty-one".