18440666556602 has 4 divisors (see below), whose sum is σ = 27660999834906. Its totient is φ = 9220333278300.

The previous prime is 18440666556581. The next prime is 18440666556649. The reversal of 18440666556602 is 20665566604481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15345779882161 + 3094886674441 = 3917369^2 + 1759229^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4610166639149 + ... + 4610166639152.

Almost surely, 2^{18440666556602} is an apocalyptic number.

18440666556602 is a deficient number, since it is larger than the sum of its proper divisors (9220333278304).

18440666556602 is an equidigital number, since it uses as much as digits as its factorization.

18440666556602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220333278303.

The product of its (nonzero) digits is 49766400, while the sum is 59.

The spelling of 18440666556602 in words is "eighteen trillion, four hundred forty billion, six hundred sixty-six million, five hundred fifty-six thousand, six hundred two".