18866279560 has 64 divisors (see below), whose sum is σ = 43583022000. Its totient is φ = 7345766400.

The previous prime is 18866279557. The next prime is 18866279561. The reversal of 18866279560 is 6597266881.

It can be written as a sum of positive squares in 8 ways, for example, as 1798947396 + 17067332164 = 42414^2 + 130642^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18866279495 and 18866279504.

It is not an unprimeable number, because it can be changed into a prime (18866279561) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 723550 + ... + 749170.

Almost surely, 2^18866279560 is an apocalyptic number.

18866279560 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 18866279560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21791511000).

18866279560 is an abundant number, since it is smaller than the sum of its proper divisors (24716742440).

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

18866279560 is a wasteful number, since it uses less digits than its factorization.

18866279560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26122 (or 26118 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 18866279560 in words is "eighteen billion, eight hundred sixty-six million, two hundred seventy-nine thousand, five hundred sixty".