43642755819281 has 2 divisors, whose sum is σ = 43642755819282. Its totient is φ = 43642755819280.

The previous prime is 43642755819263. The next prime is 43642755819283. The reversal of 43642755819281 is 18291855724634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35738695894225 + 7904059925056 = 5978185^2 + 2811416^2 .

It is a cyclic number.

It is not a de Polignac number, because 43642755819281 - 2²⁶ = 43642688710417 is a prime.

It is a super-2 number, since 2×43642755819281² (a number of 28 digits) contains 22 as substring.

Together with 43642755819283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43642755819283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21821377909640 + 21821377909641.

It is an arithmetic number, because the mean of its divisors is an integer number (21821377909641).

Almost surely, 2^{43642755819281} is an apocalyptic number.

It is an amenable number.

43642755819281 is a deficient number, since it is larger than the sum of its proper divisors (1).

43642755819281 is an equidigital number, since it uses as much as digits as its factorization.

43642755819281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116121600, while the sum is 65.

The spelling of 43642755819281 in words is "forty-three trillion, six hundred forty-two billion, seven hundred fifty-five million, eight hundred nineteen thousand, two hundred eighty-one".