20312651613539 has 2 divisors, whose sum is σ = 20312651613540. Its totient is φ = 20312651613538.

The previous prime is 20312651613511. The next prime is 20312651613559. The reversal of 20312651613539 is 93531615621302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20312651613539 - 2¹⁶ = 20312651548003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20312651613493 and 20312651613502.

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, 10156325806769 + 10156325806770.

It is an arithmetic number, because the mean of its divisors is an integer number (10156325806770).

Almost surely, 2^{20312651613539} is an apocalyptic number.

20312651613539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312651613539 is an equidigital number, since it uses as much as digits as its factorization.

20312651613539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 874800, while the sum is 47.

The spelling of 20312651613539 in words is "twenty trillion, three hundred twelve billion, six hundred fifty-one million, six hundred thirteen thousand, five hundred thirty-nine".