20512879570639 has 2 divisors, whose sum is σ = 20512879570640. Its totient is φ = 20512879570638.

The previous prime is 20512879570613. The next prime is 20512879570643. The reversal of 20512879570639 is 93607597821502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20512879570639 - 2⁵ = 20512879570607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20512879576639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256439785319 + 10256439785320.

It is an arithmetic number, because the mean of its divisors is an integer number (10256439785320).

Almost surely, 2^{20512879570639} is an apocalyptic number.

20512879570639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512879570639 is an equidigital number, since it uses as much as digits as its factorization.

20512879570639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57153600, while the sum is 64.

The spelling of 20512879570639 in words is "twenty trillion, five hundred twelve billion, eight hundred seventy-nine million, five hundred seventy thousand, six hundred thirty-nine".