1243340200057 has 2 divisors, whose sum is σ = 1243340200058. Its totient is φ = 1243340200056.

The previous prime is 1243340200019. The next prime is 1243340200153. The reversal of 1243340200057 is 7500020433421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 773527286016 + 469812914041 = 879504^2 + 685429^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243340200057 - 2²⁷ = 1243205982329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243340206057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621670100028 + 621670100029.

It is an arithmetic number, because the mean of its divisors is an integer number (621670100029).

Almost surely, 2^{1243340200057} is an apocalyptic number.

It is an amenable number.

1243340200057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243340200057 is an equidigital number, since it uses as much as digits as its factorization.

1243340200057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 31.

Adding to 1243340200057 its reverse (7500020433421), we get a palindrome (8743360633478).

The spelling of 1243340200057 in words is "one trillion, two hundred forty-three billion, three hundred forty million, two hundred thousand, fifty-seven".