218542020769 has 2 divisors, whose sum is σ = 218542020770. Its totient is φ = 218542020768.

The previous prime is 218542020757. The next prime is 218542020797. The reversal of 218542020769 is 967020245812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176999428369 + 41542592400 = 420713^2 + 203820^2 .

It is a cyclic number.

It is not a de Polignac number, because 218542020769 - 2³³ = 209952086177 is a prime.

It is a super-2 number, since 2×218542020769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218542030769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109271010384 + 109271010385.

It is an arithmetic number, because the mean of its divisors is an integer number (109271010385).

Almost surely, 2^218542020769 is an apocalyptic number.

It is an amenable number.

218542020769 is a deficient number, since it is larger than the sum of its proper divisors (1).

218542020769 is an equidigital number, since it uses as much as digits as its factorization.

218542020769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 218542020769 in words is "two hundred eighteen billion, five hundred forty-two million, twenty thousand, seven hundred sixty-nine".