20516922216529 has 2 divisors, whose sum is σ = 20516922216530. Its totient is φ = 20516922216528.

The previous prime is 20516922216491. The next prime is 20516922216541. The reversal of 20516922216529 is 92561222961502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17967637380625 + 2549284835904 = 4238825^2 + 1596648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20516922216529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20516922216829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258461108264 + 10258461108265.

It is an arithmetic number, because the mean of its divisors is an integer number (10258461108265).

Almost surely, 2^{20516922216529} is an apocalyptic number.

It is an amenable number.

20516922216529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516922216529 is an equidigital number, since it uses as much as digits as its factorization.

20516922216529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 20516922216529 in words is "twenty trillion, five hundred sixteen billion, nine hundred twenty-two million, two hundred sixteen thousand, five hundred twenty-nine".