20512879570613 has 2 divisors, whose sum is σ = 20512879570614. Its totient is φ = 20512879570612.

The previous prime is 20512879570607. The next prime is 20512879570639. The reversal of 20512879570613 is 31607597821502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12596770951249 + 7916108619364 = 3549193^2 + 2813558^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512879570613 - 2¹⁶ = 20512879505077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20512879570643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256439785306 + 10256439785307.

It is an arithmetic number, because the mean of its divisors is an integer number (10256439785307).

Almost surely, 2^{20512879570613} is an apocalyptic number.

It is an amenable number.

20512879570613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512879570613 is an equidigital number, since it uses as much as digits as its factorization.

20512879570613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 20512879570613 in words is "twenty trillion, five hundred twelve billion, eight hundred seventy-nine million, five hundred seventy thousand, six hundred thirteen".