18638686248 has 192 divisors, whose sum is σ = 58956750720. Its totient is φ = 4866624000.

The previous prime is 18638686229. The next prime is 18638686267. The reversal of 18638686248 is 84268683681.

It is an interprime number because it is at equal distance from previous prime (18638686229) and next prime (18638686267).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18638686191 and 18638686200.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1538053 + ... + 1550123.

It is an arithmetic number, because the mean of its divisors is an integer number (307066410).

Almost surely, 2^18638686248 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 18638686248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29478375360).

18638686248 is an abundant number, since it is smaller than the sum of its proper divisors (40318064472).

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

18638686248 is a wasteful number, since it uses less digits than its factorization.

18638686248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12208 (or 12197 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 60.

The spelling of 18638686248 in words is "eighteen billion, six hundred thirty-eight million, six hundred eighty-six thousand, two hundred forty-eight".