20003561253541 has 2 divisors, whose sum is σ = 20003561253542. Its totient is φ = 20003561253540.

The previous prime is 20003561253509. The next prime is 20003561253551. The reversal of 20003561253541 is 14535216530002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19193073380100 + 810487873441 = 4380990^2 + 900271^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003561253541 - 2⁵ = 20003561253509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20003561253541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003561253551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001780626770 + 10001780626771.

It is an arithmetic number, because the mean of its divisors is an integer number (10001780626771).

Almost surely, 2^{20003561253541} is an apocalyptic number.

It is an amenable number.

20003561253541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003561253541 is an equidigital number, since it uses as much as digits as its factorization.

20003561253541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 20003561253541 its reverse (14535216530002), we get a palindrome (34538777783543).

The spelling of 20003561253541 in words is "twenty trillion, three billion, five hundred sixty-one million, two hundred fifty-three thousand, five hundred forty-one".