18978979282216 has 64 divisors (see below), whose sum is σ = 36931630095360. Its totient is φ = 9133974912000.

The previous prime is 18978979282177. The next prime is 18978979282217. The reversal of 18978979282216 is 61228297987981.

It is not an unprimeable number, because it can be changed into a prime (18978979282217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35289120 + ... + 35822896.

It is an arithmetic number, because the mean of its divisors is an integer number (577056720240).

Almost surely, 2^{18978979282216} is an apocalyptic number.

It is an amenable number.

18978979282216 is a deficient number, since it is larger than the sum of its proper divisors (17952650813144).

18978979282216 is a wasteful number, since it uses less digits than its factorization.

18978979282216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534586 (or 534582 counting only the distinct ones).

The product of its digits is 877879296, while the sum is 79.

The spelling of 18978979282216 in words is "eighteen trillion, nine hundred seventy-eight billion, nine hundred seventy-nine million, two hundred eighty-two thousand, two hundred sixteen".