20648126461 has 2 divisors, whose sum is σ = 20648126462. Its totient is φ = 20648126460.

The previous prime is 20648126419. The next prime is 20648126491. The reversal of 20648126461 is 16462184602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18196391236 + 2451735225 = 134894^2 + 49515^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648126461 - 2⁷ = 20648126333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20648126491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324063230 + 10324063231.

It is an arithmetic number, because the mean of its divisors is an integer number (10324063231).

Almost surely, 2^20648126461 is an apocalyptic number.

It is an amenable number.

20648126461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648126461 is an equidigital number, since it uses as much as digits as its factorization.

20648126461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 40.

The spelling of 20648126461 in words is "twenty billion, six hundred forty-eight million, one hundred twenty-six thousand, four hundred sixty-one".