18440666601 has 8 divisors (see below), whose sum is σ = 28100063424. Its totient is φ = 10537523760.

The previous prime is 18440666597. The next prime is 18440666609. The reversal of 18440666601 is 10666604481.

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

It is not a de Polignac number, because 18440666601 - 2² = 18440666597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18440666609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439063470 + ... + 439063511.

It is an arithmetic number, because the mean of its divisors is an integer number (3512507928).

Almost surely, 2^18440666601 is an apocalyptic number.

It is an amenable number.

18440666601 is a deficient number, since it is larger than the sum of its proper divisors (9659396823).

18440666601 is an equidigital number, since it uses as much as digits as its factorization.

18440666601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878126991.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 18440666601 in words is "eighteen billion, four hundred forty million, six hundred sixty-six thousand, six hundred one".