20455721774503 has 2 divisors, whose sum is σ = 20455721774504. Its totient is φ = 20455721774502.

The previous prime is 20455721774491. The next prime is 20455721774549. The reversal of 20455721774503 is 30547712755402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20455721774503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20455721774203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227860887251 + 10227860887252.

It is an arithmetic number, because the mean of its divisors is an integer number (10227860887252).

Almost surely, 2^{20455721774503} is an apocalyptic number.

20455721774503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455721774503 is an equidigital number, since it uses as much as digits as its factorization.

20455721774503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232000, while the sum is 52.

The spelling of 20455721774503 in words is "twenty trillion, four hundred fifty-five billion, seven hundred twenty-one million, seven hundred seventy-four thousand, five hundred three".