20516525473 has 2 divisors, whose sum is σ = 20516525474. Its totient is φ = 20516525472.

The previous prime is 20516525461. The next prime is 20516525479. The reversal of 20516525473 is 37452561502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14317797649 + 6198727824 = 119657^2 + 78732^2 .

It is a cyclic number.

It is not a de Polignac number, because 20516525473 - 2¹⁷ = 20516394401 is a prime.

It is not a weakly prime, because it can be changed into another prime (20516525479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258262736 + 10258262737.

It is an arithmetic number, because the mean of its divisors is an integer number (10258262737).

Almost surely, 2^20516525473 is an apocalyptic number.

It is an amenable number.

20516525473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516525473 is an equidigital number, since it uses as much as digits as its factorization.

20516525473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 20516525473 in words is "twenty billion, five hundred sixteen million, five hundred twenty-five thousand, four hundred seventy-three".