20889944064049 has 2 divisors, whose sum is σ = 20889944064050. Its totient is φ = 20889944064048.

The previous prime is 20889944063977. The next prime is 20889944064097. The reversal of 20889944064049 is 94046044998802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16665932606449 + 4224011457600 = 4082393^2 + 2055240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20889944064049 - 2³³ = 20881354129457 is a prime.

It is a super-2 number, since 2×20889944064049² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20889944164049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10444972032024 + 10444972032025.

It is an arithmetic number, because the mean of its divisors is an integer number (10444972032025).

Almost surely, 2^{20889944064049} is an apocalyptic number.

It is an amenable number.

20889944064049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20889944064049 is an equidigital number, since it uses as much as digits as its factorization.

20889944064049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 143327232, while the sum is 67.

The spelling of 20889944064049 in words is "twenty trillion, eight hundred eighty-nine billion, nine hundred forty-four million, sixty-four thousand, forty-nine".