20465275648691 has 2 divisors, whose sum is σ = 20465275648692. Its totient is φ = 20465275648690.

The previous prime is 20465275648607. The next prime is 20465275648733. The reversal of 20465275648691 is 19684657256402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20465275648691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20465275648891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232637824345 + 10232637824346.

It is an arithmetic number, because the mean of its divisors is an integer number (10232637824346).

Almost surely, 2^{20465275648691} is an apocalyptic number.

20465275648691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20465275648691 is an equidigital number, since it uses as much as digits as its factorization.

20465275648691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174182400, while the sum is 65.

The spelling of 20465275648691 in words is "twenty trillion, four hundred sixty-five billion, two hundred seventy-five million, six hundred forty-eight thousand, six hundred ninety-one".