20666104201 has 2 divisors, whose sum is σ = 20666104202. Its totient is φ = 20666104200.

The previous prime is 20666104189. The next prime is 20666104223. The reversal of 20666104201 is 10240166602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19965972601 + 700131600 = 141301^2 + 26460^2 .

It is a cyclic number.

It is not a de Polignac number, because 20666104201 - 2²³ = 20657715593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20666104201.

It is not a weakly prime, because it can be changed into another prime (20666101201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10333052100 + 10333052101.

It is an arithmetic number, because the mean of its divisors is an integer number (10333052101).

Almost surely, 2^20666104201 is an apocalyptic number.

It is an amenable number.

20666104201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20666104201 is an equidigital number, since it uses as much as digits as its factorization.

20666104201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 20666104201 in words is "twenty billion, six hundred sixty-six million, one hundred four thousand, two hundred one".