20016566429 has 2 divisors, whose sum is σ = 20016566430. Its totient is φ = 20016566428.

The previous prime is 20016566389. The next prime is 20016566473. The reversal of 20016566429 is 92466561002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18625425625 + 1391140804 = 136475^2 + 37298^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20016566429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20016560429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008283214 + 10008283215.

It is an arithmetic number, because the mean of its divisors is an integer number (10008283215).

Almost surely, 2^20016566429 is an apocalyptic number.

It is an amenable number.

20016566429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20016566429 is an equidigital number, since it uses as much as digits as its factorization.

20016566429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 20016566429 in words is "twenty billion, sixteen million, five hundred sixty-six thousand, four hundred twenty-nine".