20166866129 has 2 divisors, whose sum is σ = 20166866130. Its totient is φ = 20166866128.

The previous prime is 20166866119. The next prime is 20166866147. The reversal of 20166866129 is 92166866102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17355427600 + 2811438529 = 131740^2 + 53023^2 .

It is a cyclic number.

It is not a de Polignac number, because 20166866129 - 2¹² = 20166862033 is a prime.

It is not a weakly prime, because it can be changed into another prime (20166866119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083433064 + 10083433065.

It is an arithmetic number, because the mean of its divisors is an integer number (10083433065).

Almost surely, 2^20166866129 is an apocalyptic number.

It is an amenable number.

20166866129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20166866129 is an equidigital number, since it uses as much as digits as its factorization.

20166866129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 20166866129 in words is "twenty billion, one hundred sixty-six million, eight hundred sixty-six thousand, one hundred twenty-nine".