20665657267 has 2 divisors, whose sum is σ = 20665657268. Its totient is φ = 20665657266.

The previous prime is 20665657237. The next prime is 20665657273. The reversal of 20665657267 is 76275656602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20665657267 is a prime.

It is not a weakly prime, because it can be changed into another prime (20665657217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332828633 + 10332828634.

It is an arithmetic number, because the mean of its divisors is an integer number (10332828634).

Almost surely, 2^20665657267 is an apocalyptic number.

20665657267 is a deficient number, since it is larger than the sum of its proper divisors (1).

20665657267 is an equidigital number, since it uses as much as digits as its factorization.

20665657267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 52.

The spelling of 20665657267 in words is "twenty billion, six hundred sixty-five million, six hundred fifty-seven thousand, two hundred sixty-seven".