20261172220607 has 2 divisors, whose sum is σ = 20261172220608. Its totient is φ = 20261172220606.

The previous prime is 20261172220579. The next prime is 20261172220621. The reversal of 20261172220607 is 70602227116202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20261172220607 - 2²² = 20261168026303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20261172220637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130586110303 + 10130586110304.

It is an arithmetic number, because the mean of its divisors is an integer number (10130586110304).

Almost surely, 2^{20261172220607} is an apocalyptic number.

20261172220607 is a deficient number, since it is larger than the sum of its proper divisors (1).

20261172220607 is an equidigital number, since it uses as much as digits as its factorization.

20261172220607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 38.

Adding to 20261172220607 its reverse (70602227116202), we get a palindrome (90863399336809).

The spelling of 20261172220607 in words is "twenty trillion, two hundred sixty-one billion, one hundred seventy-two million, two hundred twenty thousand, six hundred seven".