20351645040437 has 2 divisors, whose sum is σ = 20351645040438. Its totient is φ = 20351645040436.

The previous prime is 20351645040359. The next prime is 20351645040547. The reversal of 20351645040437 is 73404054615302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12319601585041 + 8032043455396 = 3509929^2 + 2834086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20351645040437 - 2¹⁸ = 20351644778293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20351645046437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175822520218 + 10175822520219.

It is an arithmetic number, because the mean of its divisors is an integer number (10175822520219).

Almost surely, 2^{20351645040437} is an apocalyptic number.

It is an amenable number.

20351645040437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20351645040437 is an equidigital number, since it uses as much as digits as its factorization.

20351645040437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 44.

Adding to 20351645040437 its reverse (73404054615302), we get a palindrome (93755699655739).

The spelling of 20351645040437 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-five million, forty thousand, four hundred thirty-seven".