18440666627 has 2 divisors, whose sum is σ = 18440666628. Its totient is φ = 18440666626.

The previous prime is 18440666611. The next prime is 18440666633. The reversal of 18440666627 is 72666604481.

It is a strong prime.

It is an emirp because it is prime and its reverse (72666604481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18440666627 - 2⁴ = 18440666611 is a prime.

It is not a weakly prime, because it can be changed into another prime (18440666327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9220333313 + 9220333314.

It is an arithmetic number, because the mean of its divisors is an integer number (9220333314).

Almost surely, 2^18440666627 is an apocalyptic number.

18440666627 is a deficient number, since it is larger than the sum of its proper divisors (1).

18440666627 is an equidigital number, since it uses as much as digits as its factorization.

18440666627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 18440666627 in words is "eighteen billion, four hundred forty million, six hundred sixty-six thousand, six hundred twenty-seven".