18402550560 has 144 divisors (see below), whose sum is σ = 62848389240. Its totient is φ = 4903464960.

The previous prime is 18402550489. The next prime is 18402550601. The reversal of 18402550560 is 6505520481.

18402550560 is a `hidden beast` number, since 1 + 8 + 40 + 2 + 5 + 50 + 560 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16152376464 + 2250174096 = 127092^2 + 47436^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×18402550560² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2128326 + ... + 2136954.

Almost surely, 2^18402550560 is an apocalyptic number.

18402550560 is a gapful number since it is divisible by the number (10) 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 18402550560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31424194620).

18402550560 is an abundant number, since it is smaller than the sum of its proper divisors (44445838680).

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

18402550560 is a wasteful number, since it uses less digits than its factorization.

18402550560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10131 (or 10120 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 18402550560 in words is "eighteen billion, four hundred two million, five hundred fifty thousand, five hundred sixty".