20129453569 has 2 divisors, whose sum is σ = 20129453570. Its totient is φ = 20129453568.

The previous prime is 20129453557. The next prime is 20129453627. The reversal of 20129453569 is 96535492102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18363773169 + 1765680400 = 135513^2 + 42020^2 .

It is a cyclic number.

It is not a de Polignac number, because 20129453569 - 2⁷ = 20129453441 is a prime.

It is a super-2 number, since 2×20129453569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20129456569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064726784 + 10064726785.

It is an arithmetic number, because the mean of its divisors is an integer number (10064726785).

Almost surely, 2^20129453569 is an apocalyptic number.

It is an amenable number.

20129453569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20129453569 is an equidigital number, since it uses as much as digits as its factorization.

20129453569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 20129453569 in words is "twenty billion, one hundred twenty-nine million, four hundred fifty-three thousand, five hundred sixty-nine".