20525543399 has 2 divisors, whose sum is σ = 20525543400. Its totient is φ = 20525543398.

The previous prime is 20525543327. The next prime is 20525543407. The reversal of 20525543399 is 99334552502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20525543399 - 2¹² = 20525539303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20525543309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10262771699 + 10262771700.

It is an arithmetic number, because the mean of its divisors is an integer number (10262771700).

Almost surely, 2^20525543399 is an apocalyptic number.

20525543399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525543399 is an equidigital number, since it uses as much as digits as its factorization.

20525543399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458000, while the sum is 47.

The spelling of 20525543399 in words is "twenty billion, five hundred twenty-five million, five hundred forty-three thousand, three hundred ninety-nine".