18866859660 has 288 divisors, whose sum is σ = 64886976000. Its totient is φ = 4547664000.

The previous prime is 18866859653. The next prime is 18866859677. The reversal of 18866859660 is 6695866881.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13001935 + ... + 13003385.

It is an arithmetic number, because the mean of its divisors is an integer number (225302000).

Almost surely, 2^18866859660 is an apocalyptic number.

18866859660 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 18866859660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32443488000).

18866859660 is an abundant number, since it is smaller than the sum of its proper divisors (46020116340).

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

18866859660 is a wasteful number, since it uses less digits than its factorization.

18866859660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690 (or 1671 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 63.

The spelling of 18866859660 in words is "eighteen billion, eight hundred sixty-six million, eight hundred fifty-nine thousand, six hundred sixty".