243234414557 has 2 divisors, whose sum is σ = 243234414558. Its totient is φ = 243234414556.

The previous prime is 243234414551. The next prime is 243234414587. The reversal of 243234414557 is 755414432342.

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., 141247437241 + 101986977316 = 375829^2 + 319354^2 .

It is a cyclic number.

It is not a de Polignac number, because 243234414557 - 2²² = 243230220253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243234414551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121617207278 + 121617207279.

It is an arithmetic number, because the mean of its divisors is an integer number (121617207279).

Almost surely, 2^243234414557 is an apocalyptic number.

It is an amenable number.

243234414557 is a deficient number, since it is larger than the sum of its proper divisors (1).

243234414557 is an equidigital number, since it uses as much as digits as its factorization.

243234414557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 44.

Adding to 243234414557 its reverse (755414432342), we get a palindrome (998648846899).

The spelling of 243234414557 in words is "two hundred forty-three billion, two hundred thirty-four million, four hundred fourteen thousand, five hundred fifty-seven".