20997550080037 has 2 divisors, whose sum is σ = 20997550080038. Its totient is φ = 20997550080036.

The previous prime is 20997550079963. The next prime is 20997550080049. The reversal of 20997550080037 is 73008005579902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11789293070916 + 9208257009121 = 3433554^2 + 3034511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20997550080037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20997550080037.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20997550080337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10498775040018 + 10498775040019.

It is an arithmetic number, because the mean of its divisors is an integer number (10498775040019).

Almost surely, 2^{20997550080037} is an apocalyptic number.

It is an amenable number.

20997550080037 is a deficient number, since it is larger than the sum of its proper divisors (1).

20997550080037 is an equidigital number, since it uses as much as digits as its factorization.

20997550080037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 20997550080037 in words is "twenty trillion, nine hundred ninety-seven billion, five hundred fifty million, eighty thousand, thirty-seven".