243345664129 has 2 divisors, whose sum is σ = 243345664130. Its totient is φ = 243345664128.

The previous prime is 243345664091. The next prime is 243345664153. The reversal of 243345664129 is 921466543342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231606375025 + 11739289104 = 481255^2 + 108348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243345664129 is a prime.

It is a super-2 number, since 2×243345664129² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243345664169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121672832064 + 121672832065.

It is an arithmetic number, because the mean of its divisors is an integer number (121672832065).

Almost surely, 2^243345664129 is an apocalyptic number.

It is an amenable number.

243345664129 is a deficient number, since it is larger than the sum of its proper divisors (1).

243345664129 is an equidigital number, since it uses as much as digits as its factorization.

243345664129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 49.

The spelling of 243345664129 in words is "two hundred forty-three billion, three hundred forty-five million, six hundred sixty-four thousand, one hundred twenty-nine".