218698393139 has 2 divisors, whose sum is σ = 218698393140. Its totient is φ = 218698393138.

The previous prime is 218698393091. The next prime is 218698393169. The reversal of 218698393139 is 931393896812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218698393139 - 2³⁶ = 149978916403 is a prime.

It is not a weakly prime, because it can be changed into another prime (218698393169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109349196569 + 109349196570.

It is an arithmetic number, because the mean of its divisors is an integer number (109349196570).

Almost surely, 2^218698393139 is an apocalyptic number.

218698393139 is a deficient number, since it is larger than the sum of its proper divisors (1).

218698393139 is an equidigital number, since it uses as much as digits as its factorization.

218698393139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 62.

The spelling of 218698393139 in words is "two hundred eighteen billion, six hundred ninety-eight million, three hundred ninety-three thousand, one hundred thirty-nine".