218288066402 has 24 divisors (see below), whose sum is σ = 381178962540. Its totient is φ = 93481153920.

The previous prime is 218288066401. The next prime is 218288066417. The reversal of 218288066402 is 204660882812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 164398622521 + 53889443881 = 405461^2 + 232141^2 .

It is a super-2 number, since 2×218288066402² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218288066401) 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, 713627 + ... + 972542.

Almost surely, 2^218288066402 is an apocalyptic number.

218288066402 is a deficient number, since it is larger than the sum of its proper divisors (162890896138).

218288066402 is a wasteful number, since it uses less digits than its factorization.

218288066402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687506 (or 1687499 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 47.

The spelling of 218288066402 in words is "two hundred eighteen billion, two hundred eighty-eight million, sixty-six thousand, four hundred two".