1943654222401 has 2 divisors, whose sum is σ = 1943654222402. Its totient is φ = 1943654222400.

The previous prime is 1943654222327. The next prime is 1943654222459. The reversal of 1943654222401 is 1042224563491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1631342017600 + 312312204801 = 1277240^2 + 558849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1943654222401 - 2⁷ = 1943654222273 is a prime.

It is a super-3 number, since 3×1943654222401³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1943654222501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971827111200 + 971827111201.

It is an arithmetic number, because the mean of its divisors is an integer number (971827111201).

Almost surely, 2^{1943654222401} is an apocalyptic number.

It is an amenable number.

1943654222401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1943654222401 is an equidigital number, since it uses as much as digits as its factorization.

1943654222401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 43.

Adding to 1943654222401 its reverse (1042224563491), we get a palindrome (2985878785892).

The spelling of 1943654222401 in words is "one trillion, nine hundred forty-three billion, six hundred fifty-four million, two hundred twenty-two thousand, four hundred one".