218856235023 has 18 divisors (see below), whose sum is σ = 324900545424. Its totient is φ = 141960793104.

The previous prime is 218856235001. The next prime is 218856235027. The reversal of 218856235023 is 320532658812.

218856235023 is a `hidden beast` number, since 2 + 1 + 8 + 85 + 62 + 3 + 502 + 3 = 666.

It is not a de Polignac number, because 218856235023 - 2²⁴ = 218839457807 is a prime.

It is a super-2 number, since 2×218856235023² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 218856235023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218856235027) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8869111 + ... + 8893752.

Almost surely, 2^218856235023 is an apocalyptic number.

218856235023 is a deficient number, since it is larger than the sum of its proper divisors (106044310401).

218856235023 is a wasteful number, since it uses less digits than its factorization.

218856235023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17762943 (or 17762903 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 218856235023 in words is "two hundred eighteen billion, eight hundred fifty-six million, two hundred thirty-five thousand, twenty-three".