20356363320577 has 2 divisors, whose sum is σ = 20356363320578. Its totient is φ = 20356363320576.

The previous prime is 20356363320499. The next prime is 20356363320613. The reversal of 20356363320577 is 77502336365302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20099431931121 + 256931389456 = 4483239^2 + 506884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20356363320577 is a prime.

It is a super-2 number, since 2×20356363320577² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20356363320977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178181660288 + 10178181660289.

It is an arithmetic number, because the mean of its divisors is an integer number (10178181660289).

Almost surely, 2^{20356363320577} is an apocalyptic number.

It is an amenable number.

20356363320577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356363320577 is an equidigital number, since it uses as much as digits as its factorization.

20356363320577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14288400, while the sum is 52.

Adding to 20356363320577 its reverse (77502336365302), we get a palindrome (97858699685879).

The spelling of 20356363320577 in words is "twenty trillion, three hundred fifty-six billion, three hundred sixty-three million, three hundred twenty thousand, five hundred seventy-seven".