18386636268 has 192 divisors, whose sum is σ = 58416906240. Its totient is φ = 4346092800.

The previous prime is 18386636251. The next prime is 18386636273. The reversal of 18386636268 is 86263668381.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 842073 + ... + 863631.

It is an arithmetic number, because the mean of its divisors is an integer number (304254720).

Almost surely, 2^18386636268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18386636268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29208453120).

18386636268 is an abundant number, since it is smaller than the sum of its proper divisors (40030269972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18386636268 is a wasteful number, since it uses less digits than its factorization.

18386636268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21668 (or 21666 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 57.

The spelling of 18386636268 in words is "eighteen billion, three hundred eighty-six million, six hundred thirty-six thousand, two hundred sixty-eight".