18867926416 has 20 divisors (see below), whose sum is σ = 36558737100. Its totient is φ = 9433413632.

The previous prime is 18867926401. The next prime is 18867926419. The reversal of 18867926416 is 61462976881.

It can be written as a sum of positive squares in 2 ways, for example, as 1177862400 + 17690064016 = 34320^2 + 133004^2 .

It is not an unprimeable number, because it can be changed into a prime (18867926419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519540 + ... + 554668.

It is an arithmetic number, because the mean of its divisors is an integer number (1827936855).

Almost surely, 2^18867926416 is an apocalyptic number.

18867926416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18867926416 is a deficient number, since it is larger than the sum of its proper divisors (17690810684).

18867926416 is a wasteful number, since it uses less digits than its factorization.

18867926416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68706 (or 68700 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The spelling of 18867926416 in words is "eighteen billion, eight hundred sixty-seven million, nine hundred twenty-six thousand, four hundred sixteen".