218522367841 has 2 divisors, whose sum is σ = 218522367842. Its totient is φ = 218522367840.

The previous prime is 218522367823. The next prime is 218522367857. The reversal of 218522367841 is 148763225812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214465314816 + 4057053025 = 463104^2 + 63695^2 .

It is a cyclic number.

It is not a de Polignac number, because 218522367841 - 2³⁷ = 81083414369 is a prime.

It is a super-2 number, since 2×218522367841² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218522367241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109261183920 + 109261183921.

It is an arithmetic number, because the mean of its divisors is an integer number (109261183921).

Almost surely, 2^218522367841 is an apocalyptic number.

It is an amenable number.

218522367841 is a deficient number, since it is larger than the sum of its proper divisors (1).

218522367841 is an equidigital number, since it uses as much as digits as its factorization.

218522367841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 49.

The spelling of 218522367841 in words is "two hundred eighteen billion, five hundred twenty-two million, three hundred sixty-seven thousand, eight hundred forty-one".