20653336409 has 2 divisors, whose sum is σ = 20653336410. Its totient is φ = 20653336408.

The previous prime is 20653336399. The next prime is 20653336423. The reversal of 20653336409 is 90463335602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18836190025 + 1817146384 = 137245^2 + 42628^2 .

It is a cyclic number.

It is not a de Polignac number, because 20653336409 - 2⁴ = 20653336393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20653336439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10326668204 + 10326668205.

It is an arithmetic number, because the mean of its divisors is an integer number (10326668205).

Almost surely, 2^20653336409 is an apocalyptic number.

It is an amenable number.

20653336409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653336409 is an equidigital number, since it uses as much as digits as its factorization.

20653336409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 41.

The spelling of 20653336409 in words is "twenty billion, six hundred fifty-three million, three hundred thirty-six thousand, four hundred nine".