20315636524649 has 2 divisors, whose sum is σ = 20315636524650. Its totient is φ = 20315636524648.

The previous prime is 20315636524639. The next prime is 20315636524661. The reversal of 20315636524649 is 94642563651302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10453097265625 + 9862539259024 = 3233125^2 + 3140468^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315636524649 - 2⁴ = 20315636524633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20315636524594 and 20315636524603.

It is not a weakly prime, because it can be changed into another prime (20315636524639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157818262324 + 10157818262325.

It is an arithmetic number, because the mean of its divisors is an integer number (10157818262325).

Almost surely, 2^{20315636524649} is an apocalyptic number.

It is an amenable number.

20315636524649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315636524649 is an equidigital number, since it uses as much as digits as its factorization.

20315636524649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27993600, while the sum is 56.

The spelling of 20315636524649 in words is "twenty trillion, three hundred fifteen billion, six hundred thirty-six million, five hundred twenty-four thousand, six hundred forty-nine".