20315251640533 has 2 divisors, whose sum is σ = 20315251640534. Its totient is φ = 20315251640532.

The previous prime is 20315251640441. The next prime is 20315251640611. The reversal of 20315251640533 is 33504615251302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18437809081329 + 1877442559204 = 4293927^2 + 1370198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20315251640533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20315251140533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157625820266 + 10157625820267.

It is an arithmetic number, because the mean of its divisors is an integer number (10157625820267).

Almost surely, 2^{20315251640533} is an apocalyptic number.

It is an amenable number.

20315251640533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315251640533 is an equidigital number, since it uses as much as digits as its factorization.

20315251640533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324000, while the sum is 40.

Adding to 20315251640533 its reverse (33504615251302), we get a palindrome (53819866891835).

The spelling of 20315251640533 in words is "twenty trillion, three hundred fifteen billion, two hundred fifty-one million, six hundred forty thousand, five hundred thirty-three".