18061505280 has 576 divisors, whose sum is σ = 78897745920. Its totient is φ = 3810115584.

The previous prime is 18061505263. The next prime is 18061505281. The reversal of 18061505280 is 8250516081.

18061505280 is a `hidden beast` number, since 1 + 80 + 6 + 1 + 50 + 528 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

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

It is not an unprimeable number, because it can be changed into a prime (18061505281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3142089 + ... + 3147831.

Almost surely, 2^18061505280 is an apocalyptic number.

18061505280 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 18061505280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39448872960).

18061505280 is an abundant number, since it is smaller than the sum of its proper divisors (60836240640).

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

18061505280 is a wasteful number, since it uses less digits than its factorization.

18061505280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5793 (or 5773 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 18061505280 in words is "eighteen billion, sixty-one million, five hundred five thousand, two hundred eighty".