18424090666 has 4 divisors (see below), whose sum is σ = 27636136002. Its totient is φ = 9212045332.

The previous prime is 18424090651. The next prime is 18424090667. The reversal of 18424090666 is 66609042481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66609042481 = 1097 ⋅60719273.

It can be written as a sum of positive squares in only one way, i.e., 18422361441 + 1729225 = 135729^2 + 1315^2 .

It is not an unprimeable number, because it can be changed into a prime (18424090667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4606022665 + ... + 4606022668.

Almost surely, 2^18424090666 is an apocalyptic number.

18424090666 is a deficient number, since it is larger than the sum of its proper divisors (9212045336).

18424090666 is an equidigital number, since it uses as much as digits as its factorization.

18424090666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9212045335.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 18424090666 in words is "eighteen billion, four hundred twenty-four million, ninety thousand, six hundred sixty-six".