20611272569 has 2 divisors, whose sum is σ = 20611272570. Its totient is φ = 20611272568.

The previous prime is 20611272547. The next prime is 20611272571. The reversal of 20611272569 is 96527211602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15685057600 + 4926214969 = 125240^2 + 70187^2 .

It is a cyclic number.

It is not a de Polignac number, because 20611272569 - 2⁸ = 20611272313 is a prime.

It is a super-2 number, since 2×20611272569² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 20611272571, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20611272769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10305636284 + 10305636285.

It is an arithmetic number, because the mean of its divisors is an integer number (10305636285).

Almost surely, 2^20611272569 is an apocalyptic number.

It is an amenable number.

20611272569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20611272569 is an equidigital number, since it uses as much as digits as its factorization.

20611272569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 20611272569 in words is "twenty billion, six hundred eleven million, two hundred seventy-two thousand, five hundred sixty-nine".