243155205299 has 2 divisors, whose sum is σ = 243155205300. Its totient is φ = 243155205298.

The previous prime is 243155205287. The next prime is 243155205343. The reversal of 243155205299 is 992502551342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243155205299 is a prime.

It is not a weakly prime, because it can be changed into another prime (243155205229) 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, 121577602649 + 121577602650.

It is an arithmetic number, because the mean of its divisors is an integer number (121577602650).

Almost surely, 2^243155205299 is an apocalyptic number.

243155205299 is a deficient number, since it is larger than the sum of its proper divisors (1).

243155205299 is an equidigital number, since it uses as much as digits as its factorization.

243155205299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 243155205299 in words is "two hundred forty-three billion, one hundred fifty-five million, two hundred five thousand, two hundred ninety-nine".