20495125577081 has 2 divisors, whose sum is σ = 20495125577082. Its totient is φ = 20495125577080.

The previous prime is 20495125576969. The next prime is 20495125577083. The reversal of 20495125577081 is 18077552159402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12392512090000 + 8102613487081 = 3520300^2 + 2846509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20495125577081 is a prime.

It is a super-2 number, since 2×20495125577081² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 20495125577083, 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 (20495125577083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247562788540 + 10247562788541.

It is an arithmetic number, because the mean of its divisors is an integer number (10247562788541).

Almost surely, 2^{20495125577081} is an apocalyptic number.

It is an amenable number.

20495125577081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20495125577081 is an equidigital number, since it uses as much as digits as its factorization.

20495125577081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056000, while the sum is 56.

The spelling of 20495125577081 in words is "twenty trillion, four hundred ninety-five billion, one hundred twenty-five million, five hundred seventy-seven thousand, eighty-one".