20656525671547 has 2 divisors, whose sum is σ = 20656525671548. Its totient is φ = 20656525671546.

The previous prime is 20656525671479. The next prime is 20656525671631. The reversal of 20656525671547 is 74517652565602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20656525671547 - 2¹¹ = 20656525669499 is a prime.

It is not a weakly prime, because it can be changed into another prime (20656525621547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328262835773 + 10328262835774.

It is an arithmetic number, because the mean of its divisors is an integer number (10328262835774).

Almost surely, 2^{20656525671547} is an apocalyptic number.

20656525671547 is a deficient number, since it is larger than the sum of its proper divisors (1).

20656525671547 is an equidigital number, since it uses as much as digits as its factorization.

20656525671547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840000, while the sum is 61.

The spelling of 20656525671547 in words is "twenty trillion, six hundred fifty-six billion, five hundred twenty-five million, six hundred seventy-one thousand, five hundred forty-seven".