20542573523897 has 2 divisors, whose sum is σ = 20542573523898. Its totient is φ = 20542573523896.

The previous prime is 20542573523863. The next prime is 20542573523911. The reversal of 20542573523897 is 79832537524502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18374776669561 + 2167796854336 = 4286581^2 + 1472344^2 .

It is a cyclic number.

It is not a de Polignac number, because 20542573523897 - 2⁶ = 20542573523833 is a prime.

It is a super-3 number, since 3×20542573523897³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20542573523827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271286761948 + 10271286761949.

It is an arithmetic number, because the mean of its divisors is an integer number (10271286761949).

Almost surely, 2^{20542573523897} is an apocalyptic number.

It is an amenable number.

20542573523897 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542573523897 is an equidigital number, since it uses as much as digits as its factorization.

20542573523897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008000, while the sum is 62.

The spelling of 20542573523897 in words is "twenty trillion, five hundred forty-two billion, five hundred seventy-three million, five hundred twenty-three thousand, eight hundred ninety-seven".