19949282161 has 16 divisors (see below), whose sum is σ = 21951078400. Its totient is φ = 18058107600.

The previous prime is 19949282141. The next prime is 19949282209. The reversal of 19949282161 is 16128294991.

It is not a de Polignac number, because 19949282161 - 2¹³ = 19949273969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19949282099 and 19949282108.

It is not an unprimeable number, because it can be changed into a prime (19949282131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167835 + ... + 260896.

It is an arithmetic number, because the mean of its divisors is an integer number (1371942400).

Almost surely, 2^19949282161 is an apocalyptic number.

It is an amenable number.

19949282161 is a deficient number, since it is larger than the sum of its proper divisors (2001796239).

19949282161 is a wasteful number, since it uses less digits than its factorization.

19949282161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428860.

The product of its digits is 559872, while the sum is 52.

The spelling of 19949282161 in words is "nineteen billion, nine hundred forty-nine million, two hundred eighty-two thousand, one hundred sixty-one".