218720552823 has 12 divisors (see below), whose sum is σ = 318202564680. Its totient is φ = 144764681616.

The previous prime is 218720552797. The next prime is 218720552863. The reversal of 218720552823 is 328255027812.

218720552823 is a `hidden beast` number, since 2 + 1 + 8 + 72 + 0 + 552 + 8 + 23 = 666.

It is not a de Polignac number, because 218720552823 - 2¹⁰ = 218720551799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218720552863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87417036 + ... + 87419537.

It is an arithmetic number, because the mean of its divisors is an integer number (26516880390).

Almost surely, 2^218720552823 is an apocalyptic number.

218720552823 is a deficient number, since it is larger than the sum of its proper divisors (99482011857).

218720552823 is a wasteful number, since it uses less digits than its factorization.

218720552823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174836718 (or 174836715 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 218720552823 in words is "two hundred eighteen billion, seven hundred twenty million, five hundred fifty-two thousand, eight hundred twenty-three".