218428488433 has 2 divisors, whose sum is σ = 218428488434. Its totient is φ = 218428488432.

The previous prime is 218428488391. The next prime is 218428488461. The reversal of 218428488433 is 334884824812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217891036944 + 537451489 = 466788^2 + 23183^2 .

It is a cyclic number.

It is not a de Polignac number, because 218428488433 - 2¹³ = 218428480241 is a prime.

It is a super-2 number, since 2×218428488433² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218428488493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109214244216 + 109214244217.

It is an arithmetic number, because the mean of its divisors is an integer number (109214244217).

Almost surely, 2^218428488433 is an apocalyptic number.

It is an amenable number.

218428488433 is a deficient number, since it is larger than the sum of its proper divisors (1).

218428488433 is an equidigital number, since it uses as much as digits as its factorization.

218428488433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9437184, while the sum is 55.

The spelling of 218428488433 in words is "two hundred eighteen billion, four hundred twenty-eight million, four hundred eighty-eight thousand, four hundred thirty-three".