16502766250021 has 2 divisors, whose sum is σ = 16502766250022. Its totient is φ = 16502766250020.

The previous prime is 16502766249971. The next prime is 16502766250031. The reversal of 16502766250021 is 12005266720561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14074607604996 + 2428158645025 = 3751614^2 + 1558255^2 .

It is a cyclic number.

It is not a de Polignac number, because 16502766250021 - 2²¹ = 16502764152869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16502766250021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16502766250031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8251383125010 + 8251383125011.

It is an arithmetic number, because the mean of its divisors is an integer number (8251383125011).

Almost surely, 2^{16502766250021} is an apocalyptic number.

It is an amenable number.

16502766250021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16502766250021 is an equidigital number, since it uses as much as digits as its factorization.

16502766250021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 16502766250021 in words is "sixteen trillion, five hundred two billion, seven hundred sixty-six million, two hundred fifty thousand, twenty-one".