20501011515001 has 2 divisors, whose sum is σ = 20501011515002. Its totient is φ = 20501011515000.

The previous prime is 20501011514959. The next prime is 20501011515013. The reversal of 20501011515001 is 10051511010502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11032867123776 + 9468144391225 = 3321576^2 + 3077035^2 .

It is a cyclic number.

It is not a de Polignac number, because 20501011515001 - 2¹⁵ = 20501011482233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20501011515071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250505757500 + 10250505757501.

It is an arithmetic number, because the mean of its divisors is an integer number (10250505757501).

Almost surely, 2^{20501011515001} is an apocalyptic number.

It is an amenable number.

20501011515001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501011515001 is an equidigital number, since it uses as much as digits as its factorization.

20501011515001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250, while the sum is 22.

Adding to 20501011515001 its reverse (10051511010502), we get a palindrome (30552522525503).

The spelling of 20501011515001 in words is "twenty trillion, five hundred one billion, eleven million, five hundred fifteen thousand, one".