218038985513 has 2 divisors, whose sum is σ = 218038985514. Its totient is φ = 218038985512.

The previous prime is 218038985473. The next prime is 218038985551. The reversal of 218038985513 is 315589830812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119375778064 + 98663207449 = 345508^2 + 314107^2 .

It is a cyclic number.

It is not a de Polignac number, because 218038985513 - 2⁸ = 218038985257 is a prime.

It is not a weakly prime, because it can be changed into another prime (218038915513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109019492756 + 109019492757.

It is an arithmetic number, because the mean of its divisors is an integer number (109019492757).

Almost surely, 2^218038985513 is an apocalyptic number.

It is an amenable number.

218038985513 is a deficient number, since it is larger than the sum of its proper divisors (1).

218038985513 is an equidigital number, since it uses as much as digits as its factorization.

218038985513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 218038985513 in words is "two hundred eighteen billion, thirty-eight million, nine hundred eighty-five thousand, five hundred thirteen".