218405740939 has 2 divisors, whose sum is σ = 218405740940. Its totient is φ = 218405740938.

The previous prime is 218405740919. The next prime is 218405740967. The reversal of 218405740939 is 939047504812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218405740939 - 2⁵ = 218405740907 is a prime.

It is a super-2 number, since 2×218405740939² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218405740909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109202870469 + 109202870470.

It is an arithmetic number, because the mean of its divisors is an integer number (109202870470).

Almost surely, 2^218405740939 is an apocalyptic number.

218405740939 is a deficient number, since it is larger than the sum of its proper divisors (1).

218405740939 is an equidigital number, since it uses as much as digits as its factorization.

218405740939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 218405740939 in words is "two hundred eighteen billion, four hundred five million, seven hundred forty thousand, nine hundred thirty-nine".