20001971765959 has 2 divisors, whose sum is σ = 20001971765960. Its totient is φ = 20001971765958.

The previous prime is 20001971765953. The next prime is 20001971765989. The reversal of 20001971765959 is 95956717910002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001971765959 - 2⁵ = 20001971765927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001971765897 and 20001971765906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001971765953) 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, 10000985882979 + 10000985882980.

It is an arithmetic number, because the mean of its divisors is an integer number (10000985882980).

Almost surely, 2^{20001971765959} is an apocalyptic number.

20001971765959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001971765959 is an equidigital number, since it uses as much as digits as its factorization.

20001971765959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10716300, while the sum is 61.

The spelling of 20001971765959 in words is "twenty trillion, one billion, nine hundred seventy-one million, seven hundred sixty-five thousand, nine hundred fifty-nine".