216387640418873 has 16 divisors (see below), whose sum is σ = 269806566850560. Its totient is φ = 168598387280400.

The previous prime is 216387640418821. The next prime is 216387640418897. The reversal of 216387640418873 is 378814046783612.

It is not a de Polignac number, because 216387640418873 - 2⁶ = 216387640418809 is a prime.

It is a super-3 number, since 3×216387640418873³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216387640408873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127136633 + ... + 128827398.

It is an arithmetic number, because the mean of its divisors is an integer number (16862910428160).

Almost surely, 2^{216387640418873} is an apocalyptic number.

It is an amenable number.

216387640418873 is a deficient number, since it is larger than the sum of its proper divisors (53418926431687).

216387640418873 is a wasteful number, since it uses less digits than its factorization.

216387640418873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255975028.

The product of its (nonzero) digits is 260112384, while the sum is 68.

The spelling of 216387640418873 in words is "two hundred sixteen trillion, three hundred eighty-seven billion, six hundred forty million, four hundred eighteen thousand, eight hundred seventy-three".