218787053393 has 2 divisors, whose sum is σ = 218787053394. Its totient is φ = 218787053392.

The previous prime is 218787053369. The next prime is 218787053423. The reversal of 218787053393 is 393350787812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144728506624 + 74058546769 = 380432^2 + 272137^2 .

It is a cyclic number.

It is not a de Polignac number, because 218787053393 - 2⁸ = 218787053137 is a prime.

It is not a weakly prime, because it can be changed into another prime (218787053323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109393526696 + 109393526697.

It is an arithmetic number, because the mean of its divisors is an integer number (109393526697).

Almost surely, 2^218787053393 is an apocalyptic number.

It is an amenable number.

218787053393 is a deficient number, since it is larger than the sum of its proper divisors (1).

218787053393 is an equidigital number, since it uses as much as digits as its factorization.

218787053393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 218787053393 in words is "two hundred eighteen billion, seven hundred eighty-seven million, fifty-three thousand, three hundred ninety-three".