218824399097 has 4 divisors (see below), whose sum is σ = 218847955620. Its totient is φ = 218800842576.

The previous prime is 218824399093. The next prime is 218824399111. The reversal of 218824399097 is 790993428812.

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 40418689936 + 178405709161 = 201044^2 + 422381^2 .

It is a cyclic number.

It is not a de Polignac number, because 218824399097 - 2² = 218824399093 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218824399093) 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, 11764322 + ... + 11782907.

It is an arithmetic number, because the mean of its divisors is an integer number (54711988905).

Almost surely, 2^218824399097 is an apocalyptic number.

It is an amenable number.

218824399097 is a deficient number, since it is larger than the sum of its proper divisors (23556523).

218824399097 is an equidigital number, since it uses as much as digits as its factorization.

218824399097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23556522.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 218824399097 in words is "two hundred eighteen billion, eight hundred twenty-four million, three hundred ninety-nine thousand, ninety-seven".