2645744371549 has 2 divisors, whose sum is σ = 2645744371550. Its totient is φ = 2645744371548.

The previous prime is 2645744371537. The next prime is 2645744371597. The reversal of 2645744371549 is 9451734475462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2586008123449 + 59736248100 = 1608107^2 + 244410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645744371549 - 2¹¹ = 2645744369501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2645744371349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322872185774 + 1322872185775.

It is an arithmetic number, because the mean of its divisors is an integer number (1322872185775).

Almost surely, 2^{2645744371549} is an apocalyptic number.

It is an amenable number.

2645744371549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645744371549 is an equidigital number, since it uses as much as digits as its factorization.

2645744371549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 101606400, while the sum is 61.

The spelling of 2645744371549 in words is "two trillion, six hundred forty-five billion, seven hundred forty-four million, three hundred seventy-one thousand, five hundred forty-nine".