20261172220579 has 2 divisors, whose sum is σ = 20261172220580. Its totient is φ = 20261172220578.

The previous prime is 20261172220571. The next prime is 20261172220607. The reversal of 20261172220579 is 97502227116202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20261172220579 - 2³ = 20261172220571 is a prime.

It is not a weakly prime, because it can be changed into another prime (20261172220571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130586110289 + 10130586110290.

It is an arithmetic number, because the mean of its divisors is an integer number (10130586110290).

Almost surely, 2^{20261172220579} is an apocalyptic number.

20261172220579 is a deficient number, since it is larger than the sum of its proper divisors (1).

20261172220579 is an equidigital number, since it uses as much as digits as its factorization.

20261172220579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 20261172220579 in words is "twenty trillion, two hundred sixty-one billion, one hundred seventy-two million, two hundred twenty thousand, five hundred seventy-nine".