218388231433 has 2 divisors, whose sum is σ = 218388231434. Its totient is φ = 218388231432.

The previous prime is 218388231409. The next prime is 218388231437. The reversal of 218388231433 is 334132883812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216962187264 + 1426044169 = 465792^2 + 37763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218388231433 is a prime.

It is not a weakly prime, because it can be changed into another prime (218388231437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109194115716 + 109194115717.

It is an arithmetic number, because the mean of its divisors is an integer number (109194115717).

Almost surely, 2^218388231433 is an apocalyptic number.

It is an amenable number.

218388231433 is a deficient number, since it is larger than the sum of its proper divisors (1).

218388231433 is an equidigital number, since it uses as much as digits as its factorization.

218388231433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 46.

The spelling of 218388231433 in words is "two hundred eighteen billion, three hundred eighty-eight million, two hundred thirty-one thousand, four hundred thirty-three".