18469947888 has 360 divisors, whose sum is σ = 63330863232. Its totient is φ = 5194772352.

The previous prime is 18469947869. The next prime is 18469947907. The reversal of 18469947888 is 88874996481.

It is a happy number.

18469947888 is a `hidden beast` number, since 1 + 8 + 469 + 94 + 78 + 8 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (18469947869) and next prime (18469947907).

It is a super-2 number, since 2×18469947888² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12763581 + ... + 12765027.

Almost surely, 2^18469947888 is an apocalyptic number.

18469947888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18469947888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31665431616).

18469947888 is an abundant number, since it is smaller than the sum of its proper divisors (44860915344).

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

18469947888 is a wasteful number, since it uses less digits than its factorization.

18469947888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551 (or 1526 counting only the distinct ones).

The product of its digits is 222953472, while the sum is 72.

The spelling of 18469947888 in words is "eighteen billion, four hundred sixty-nine million, nine hundred forty-seven thousand, eight hundred eighty-eight".