218961487861388 has 12 divisors (see below), whose sum is σ = 383183015088720. Its totient is φ = 109480626407472.

The previous prime is 218961487861357. The next prime is 218961487861397. The reversal of 218961487861388 is 883168784169812.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25120103 + ... + 32694686.

It is an arithmetic number, because the mean of its divisors is an integer number (31931917924060).

Almost surely, 2^{218961487861388} is an apocalyptic number.

It is an amenable number.

218961487861388 is a deficient number, since it is larger than the sum of its proper divisors (164221527227332).

218961487861388 is a wasteful number, since it uses less digits than its factorization.

218961487861388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58761616 (or 58761614 counting only the distinct ones).

The product of its digits is 1783627776, while the sum is 80.

The spelling of 218961487861388 in words is "two hundred eighteen trillion, nine hundred sixty-one billion, four hundred eighty-seven million, eight hundred sixty-one thousand, three hundred eighty-eight".