218052669521 has 2 divisors, whose sum is σ = 218052669522. Its totient is φ = 218052669520.

The previous prime is 218052669503. The next prime is 218052669533. The reversal of 218052669521 is 125966250812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143668289296 + 74384380225 = 379036^2 + 272735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218052669521 is a prime.

It is not a weakly prime, because it can be changed into another prime (218052669721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109026334760 + 109026334761.

It is an arithmetic number, because the mean of its divisors is an integer number (109026334761).

Almost surely, 2^218052669521 is an apocalyptic number.

It is an amenable number.

218052669521 is a deficient number, since it is larger than the sum of its proper divisors (1).

218052669521 is an equidigital number, since it uses as much as digits as its factorization.

218052669521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 218052669521 in words is "two hundred eighteen billion, fifty-two million, six hundred sixty-nine thousand, five hundred twenty-one".