18566066640 has 160 divisors (see below), whose sum is σ = 63647819136. Its totient is φ = 4439162880.

The previous prime is 18566066599. The next prime is 18566066669. The reversal of 18566066640 is 4666066581.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18566066640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144552 + ... + 240888.

Almost surely, 2^18566066640 is an apocalyptic number.

18566066640 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 18566066640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31823909568).

18566066640 is an abundant number, since it is smaller than the sum of its proper divisors (45081752496).

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

18566066640 is a wasteful number, since it uses less digits than its factorization.

18566066640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96437 (or 96431 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 18566066640 in words is "eighteen billion, five hundred sixty-six million, sixty-six thousand, six hundred forty".