20350352621693 has 2 divisors, whose sum is σ = 20350352621694. Its totient is φ = 20350352621692.

The previous prime is 20350352621597. The next prime is 20350352621741. The reversal of 20350352621693 is 39612625305302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12842604660964 + 7507747960729 = 3583658^2 + 2740027^2 .

It is a cyclic number.

It is not a de Polignac number, because 20350352621693 - 2³⁸ = 20075474714749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20350352629693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175176310846 + 10175176310847.

It is an arithmetic number, because the mean of its divisors is an integer number (10175176310847).

Almost surely, 2^{20350352621693} is an apocalyptic number.

It is an amenable number.

20350352621693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20350352621693 is an equidigital number, since it uses as much as digits as its factorization.

20350352621693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 47.

Adding to 20350352621693 its reverse (39612625305302), we get a palindrome (59962977926995).

The spelling of 20350352621693 in words is "twenty trillion, three hundred fifty billion, three hundred fifty-two million, six hundred twenty-one thousand, six hundred ninety-three".