20516353546433 has 2 divisors, whose sum is σ = 20516353546434. Its totient is φ = 20516353546432.

The previous prime is 20516353546417. The next prime is 20516353546441. The reversal of 20516353546433 is 33464535361502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19715269475344 + 801084071089 = 4440188^2 + 895033^2 .

It is a cyclic number.

It is not a de Polignac number, because 20516353546433 - 2⁴ = 20516353546417 is a prime.

It is not a weakly prime, because it can be changed into another prime (20516353516433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258176773216 + 10258176773217.

It is an arithmetic number, because the mean of its divisors is an integer number (10258176773217).

Almost surely, 2^{20516353546433} is an apocalyptic number.

It is an amenable number.

20516353546433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516353546433 is an equidigital number, since it uses as much as digits as its factorization.

20516353546433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664000, while the sum is 50.

The spelling of 20516353546433 in words is "twenty trillion, five hundred sixteen billion, three hundred fifty-three million, five hundred forty-six thousand, four hundred thirty-three".