218281983393 has 32 divisors (see below), whose sum is σ = 306914181120. Its totient is φ = 137789930880.

The previous prime is 218281983323. The next prime is 218281983401. The reversal of 218281983393 is 393389182812.

It is a happy number.

It is not a de Polignac number, because 218281983393 - 2⁸ = 218281983137 is a prime.

It is a super-3 number, since 3×218281983393³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (218281983323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22763746 + ... + 22773332.

It is an arithmetic number, because the mean of its divisors is an integer number (9591068160).

Almost surely, 2^218281983393 is an apocalyptic number.

It is an amenable number.

218281983393 is a deficient number, since it is larger than the sum of its proper divisors (88632197727).

218281983393 is a wasteful number, since it uses less digits than its factorization.

218281983393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14877.

The product of its digits is 4478976, while the sum is 57.

The spelling of 218281983393 in words is "two hundred eighteen billion, two hundred eighty-one million, nine hundred eighty-three thousand, three hundred ninety-three".