20368494161 has 2 divisors, whose sum is σ = 20368494162. Its totient is φ = 20368494160.

The previous prime is 20368494151. The next prime is 20368494163. The reversal of 20368494161 is 16149486302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10492109761 + 9876384400 = 102431^2 + 99380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20368494161 is a prime.

Together with 20368494163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20368494163) 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 as a sum of consecutive naturals, namely, 10184247080 + 10184247081.

It is an arithmetic number, because the mean of its divisors is an integer number (10184247081).

Almost surely, 2^20368494161 is an apocalyptic number.

It is an amenable number.

20368494161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20368494161 is an equidigital number, since it uses as much as digits as its factorization.

20368494161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 20368494161 in words is "twenty billion, three hundred sixty-eight million, four hundred ninety-four thousand, one hundred sixty-one".