18669994560 has 560 divisors, whose sum is σ = 77697518976. Its totient is φ = 4166443008.

The previous prime is 18669994489. The next prime is 18669994571. The reversal of 18669994560 is 6549996681.

18669994560 is a `hidden beast` number, since 1 + 8 + 6 + 69 + 9 + 9 + 4 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (560).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 7800724 + ... + 7803116.

Almost surely, 2^18669994560 is an apocalyptic number.

18669994560 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 18669994560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38848759488).

18669994560 is an abundant number, since it is smaller than the sum of its proper divisors (59027524416).

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

18669994560 is a wasteful number, since it uses less digits than its factorization.

18669994560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472 (or 2453 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 18669994560 in words is "eighteen billion, six hundred sixty-nine million, nine hundred ninety-four thousand, five hundred sixty".