19706825161 has 3 divisors (see below), whose sum is σ = 19706965543. Its totient is φ = 19706684780.

The previous prime is 19706825141. The next prime is 19706825167. The reversal of 19706825161 is 16152860791.

The square root of 19706825161 is 140381.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16152860791 = 613 ⋅26350507.

It can be written as a sum of positive squares in only one way, i.e., 17800629561 + 1906195600 = 133419^2 + 43660^2 .

It is not a de Polignac number, because 19706825161 - 2⁵ = 19706825129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19706825167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 70191 + ... + 210571.

Almost surely, 2^19706825161 is an apocalyptic number.

19706825161 is the 140381-st square number.

19706825161 is the 70191-st centered octagonal number.

It is an amenable number.

19706825161 is a deficient number, since it is larger than the sum of its proper divisors (140382).

19706825161 is an frugal number, since it uses more digits than its factorization.

19706825161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280762 (or 140381 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 19706825161 in words is "nineteen billion, seven hundred six million, eight hundred twenty-five thousand, one hundred sixty-one".