20516263129 has 2 divisors, whose sum is σ = 20516263130. Its totient is φ = 20516263128.

The previous prime is 20516263123. The next prime is 20516263169. The reversal of 20516263129 is 92136261502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18056103129 + 2460160000 = 134373^2 + 49600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20516263129 is a prime.

It is not a weakly prime, because it can be changed into another prime (20516263123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258131564 + 10258131565.

It is an arithmetic number, because the mean of its divisors is an integer number (10258131565).

Almost surely, 2^20516263129 is an apocalyptic number.

It is an amenable number.

20516263129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516263129 is an equidigital number, since it uses as much as digits as its factorization.

20516263129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 20516263129 in words is "twenty billion, five hundred sixteen million, two hundred sixty-three thousand, one hundred twenty-nine".