18386618280 has 128 divisors (see below), whose sum is σ = 57229200000. Its totient is φ = 4720149504.

The previous prime is 18386618267. The next prime is 18386618287. The reversal of 18386618280 is 8281668381.

It is not an unprimeable number, because it can be changed into a prime (18386618287) 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, 1206951 + ... + 1222089.

It is an arithmetic number, because the mean of its divisors is an integer number (447103125).

Almost surely, 2^18386618280 is an apocalyptic number.

18386618280 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 18386618280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28614600000).

18386618280 is an abundant number, since it is smaller than the sum of its proper divisors (38842581720).

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

18386618280 is a wasteful number, since it uses less digits than its factorization.

18386618280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15531 (or 15527 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 51.

The spelling of 18386618280 in words is "eighteen billion, three hundred eighty-six million, six hundred eighteen thousand, two hundred eighty".