218427931209645 has 40 divisors (see below), whose sum is σ = 391555173436416. Its totient is φ = 116494039210464.

The previous prime is 218427931209629. The next prime is 218427931209673. The reversal of 218427931209645 is 546902139724812.

It is a happy number.

218427931209645 is a `hidden beast` number, since 2 + 1 + 8 + 4 + 279 + 312 + 0 + 9 + 6 + 45 = 666.

It is not a de Polignac number, because 218427931209645 - 2⁴ = 218427931209629 is a prime.

It is a super-3 number, since 3×218427931209645³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 55135144 + ... + 58963886.

It is a 1-persistent number, because it is pandigital, but 2⋅218427931209645 = 436855862419290 is not.

Almost surely, 2^{218427931209645} is an apocalyptic number.

It is an amenable number.

218427931209645 is a deficient number, since it is larger than the sum of its proper divisors (173127242226771).

218427931209645 is a wasteful number, since it uses less digits than its factorization.

218427931209645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969623 (or 3969614 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 218427931209645 in words is "two hundred eighteen trillion, four hundred twenty-seven billion, nine hundred thirty-one million, two hundred nine thousand, six hundred forty-five".