20666104297 has 2 divisors, whose sum is σ = 20666104298. Its totient is φ = 20666104296.

The previous prime is 20666104273. The next prime is 20666104367. The reversal of 20666104297 is 79240166602.

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., 12483816361 + 8182287936 = 111731^2 + 90456^2 .

It is a cyclic number.

It is not a de Polignac number, because 20666104297 - 2¹⁵ = 20666071529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20666104097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10333052148 + 10333052149.

It is an arithmetic number, because the mean of its divisors is an integer number (10333052149).

Almost surely, 2^20666104297 is an apocalyptic number.

It is an amenable number.

20666104297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20666104297 is an equidigital number, since it uses as much as digits as its factorization.

20666104297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 20666104297 in words is "twenty billion, six hundred sixty-six million, one hundred four thousand, two hundred ninety-seven".