20255243543357 has 2 divisors, whose sum is σ = 20255243543358. Its totient is φ = 20255243543356.

The previous prime is 20255243543299. The next prime is 20255243543363. The reversal of 20255243543357 is 75334534255202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19157901396676 + 1097342146681 = 4376974^2 + 1047541^2 .

It is a cyclic number.

It is not a de Polignac number, because 20255243543357 - 2¹⁸ = 20255243281213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20255243543257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10127621771678 + 10127621771679.

It is an arithmetic number, because the mean of its divisors is an integer number (10127621771679).

Almost surely, 2^{20255243543357} is an apocalyptic number.

It is an amenable number.

20255243543357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20255243543357 is an equidigital number, since it uses as much as digits as its factorization.

20255243543357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120000, while the sum is 50.

Adding to 20255243543357 its reverse (75334534255202), we get a palindrome (95589777798559).

The spelling of 20255243543357 in words is "twenty trillion, two hundred fifty-five billion, two hundred forty-three million, five hundred forty-three thousand, three hundred fifty-seven".