1643737536013 has 2 divisors, whose sum is σ = 1643737536014. Its totient is φ = 1643737536012.

The previous prime is 1643737535927. The next prime is 1643737536037. The reversal of 1643737536013 is 3106357373461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1015392782889 + 628344753124 = 1007667^2 + 792682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643737536013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643737536313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821868768006 + 821868768007.

It is an arithmetic number, because the mean of its divisors is an integer number (821868768007).

Almost surely, 2^{1643737536013} is an apocalyptic number.

It is an amenable number.

1643737536013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643737536013 is an equidigital number, since it uses as much as digits as its factorization.

1643737536013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 49.

The spelling of 1643737536013 in words is "one trillion, six hundred forty-three billion, seven hundred thirty-seven million, five hundred thirty-six thousand, thirteen".