20525344513 has 2 divisors, whose sum is σ = 20525344514. Its totient is φ = 20525344512.

The previous prime is 20525344507. The next prime is 20525344549. The reversal of 20525344513 is 31544352502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16410378609 + 4114965904 = 128103^2 + 64148^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525344513 - 2²¹ = 20523247361 is a prime.

It is not a weakly prime, because it can be changed into another prime (20525344583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10262672256 + 10262672257.

It is an arithmetic number, because the mean of its divisors is an integer number (10262672257).

Almost surely, 2^20525344513 is an apocalyptic number.

It is an amenable number.

20525344513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525344513 is an equidigital number, since it uses as much as digits as its factorization.

20525344513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 34.

The spelling of 20525344513 in words is "twenty billion, five hundred twenty-five million, three hundred forty-four thousand, five hundred thirteen".