218038122660997 has 4 divisors (see below), whose sum is σ = 223931044895116. Its totient is φ = 212145200426880.

The previous prime is 218038122660913. The next prime is 218038122661003. The reversal of 218038122660997 is 799066221830812.

It is a Cunningham number, because it is equal to 14766114²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 195103515458916 + 22934607202081 = 13967946^2 + 4789009^2 .

It is a cyclic number.

It is not a de Polignac number, because 218038122660997 - 2¹⁵ = 218038122628229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218038122160997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2946461117004 + ... + 2946461117077.

It is an arithmetic number, because the mean of its divisors is an integer number (55982761223779).

Almost surely, 2^{218038122660997} is an apocalyptic number.

It is an amenable number.

218038122660997 is a deficient number, since it is larger than the sum of its proper divisors (5892922234119).

218038122660997 is an equidigital number, since it uses as much as digits as its factorization.

218038122660997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5892922234118.

The product of its (nonzero) digits is 31352832, while the sum is 64.

The spelling of 218038122660997 in words is "two hundred eighteen trillion, thirty-eight billion, one hundred twenty-two million, six hundred sixty thousand, nine hundred ninety-seven".