18195448666 has 8 divisors (see below), whose sum is σ = 27304216884. Its totient is φ = 9094043040.

The previous prime is 18195448651. The next prime is 18195448673. The reversal of 18195448666 is 66684459181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17770223025 + 425225641 = 133305^2 + 20621^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18195448666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1834465 + ... + 1844356.

Almost surely, 2^18195448666 is an apocalyptic number.

18195448666 is a deficient number, since it is larger than the sum of its proper divisors (9108768218).

18195448666 is a wasteful number, since it uses less digits than its factorization.

18195448666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681296.

The product of its digits is 9953280, while the sum is 58.

The spelling of 18195448666 in words is "eighteen billion, one hundred ninety-five million, four hundred forty-eight thousand, six hundred sixty-six".