20312651613559 has 2 divisors, whose sum is σ = 20312651613560. Its totient is φ = 20312651613558.

The previous prime is 20312651613539. The next prime is 20312651613593. The reversal of 20312651613559 is 95531615621302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20312651613559 - 2¹⁹ = 20312651089271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312651613509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156325806779 + 10156325806780.

It is an arithmetic number, because the mean of its divisors is an integer number (10156325806780).

Almost surely, 2^{20312651613559} is an apocalyptic number.

20312651613559 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312651613559 is an equidigital number, since it uses as much as digits as its factorization.

20312651613559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 49.

The spelling of 20312651613559 in words is "twenty trillion, three hundred twelve billion, six hundred fifty-one million, six hundred thirteen thousand, five hundred fifty-nine".