2394443665261 has 2 divisors, whose sum is σ = 2394443665262. Its totient is φ = 2394443665260.

The previous prime is 2394443665259. The next prime is 2394443665267. The reversal of 2394443665261 is 1625663444932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2390057252361 + 4386412900 = 1545981^2 + 66230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2394443665261 - 2¹ = 2394443665259 is a prime.

It is a super-2 number, since 2×2394443665261² (a number of 26 digits) contains 22 as substring.

Together with 2394443665259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2394443665267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1197221832630 + 1197221832631.

It is an arithmetic number, because the mean of its divisors is an integer number (1197221832631).

Almost surely, 2^{2394443665261} is an apocalyptic number.

It is an amenable number.

2394443665261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2394443665261 is an equidigital number, since it uses as much as digits as its factorization.

2394443665261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22394880, while the sum is 55.

The spelling of 2394443665261 in words is "two trillion, three hundred ninety-four billion, four hundred forty-three million, six hundred sixty-five thousand, two hundred sixty-one".