218373256215 has 24 divisors (see below), whose sum is σ = 383844827808. Its totient is φ = 114825372480.

The previous prime is 218373256193. The next prime is 218373256243. The reversal of 218373256215 is 512652373812.

218373256215 is a `hidden beast` number, since 2 + 1 + 8 + 3 + 73 + 2 + 562 + 15 = 666.

218373256215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218373256215 - 2⁵ = 218373256183 is a prime.

It is a super-2 number, since 2×218373256215² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34171024 + ... + 34177413.

It is an arithmetic number, because the mean of its divisors is an integer number (15993534492).

Almost surely, 2^218373256215 is an apocalyptic number.

218373256215 is a deficient number, since it is larger than the sum of its proper divisors (165471571593).

218373256215 is a wasteful number, since it uses less digits than its factorization.

218373256215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68348519 (or 68348516 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 218373256215 in words is "two hundred eighteen billion, three hundred seventy-three million, two hundred fifty-six thousand, two hundred fifteen".