18261622848 has 224 divisors, whose sum is σ = 57371975680. Its totient is φ = 5016453120.

The previous prime is 18261622843. The next prime is 18261622871. The reversal of 18261622848 is 84822616281.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×18261622848² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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 = 18261622797 and 18261622806.

It is not an unprimeable number, because it can be changed into a prime (18261622843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6789888 + ... + 6792576.

Almost surely, 2^18261622848 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 18261622848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28685987840).

18261622848 is an abundant number, since it is smaller than the sum of its proper divisors (39110352832).

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

18261622848 is a wasteful number, since it uses less digits than its factorization.

18261622848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905 (or 2895 counting only the distinct ones).

The product of its digits is 589824, while the sum is 48.

The spelling of 18261622848 in words is "eighteen billion, two hundred sixty-one million, six hundred twenty-two thousand, eight hundred forty-eight".