18628664066 has 8 divisors (see below), whose sum is σ = 27962554620. Its totient is φ = 9307812528.

The previous prime is 18628664017. The next prime is 18628664069. The reversal of 18628664066 is 66046682681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18312855625 + 315808441 = 135325^2 + 17771^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18628663999 and 18628664017.

It is not an unprimeable number, because it can be changed into a prime (18628664069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3256181 + ... + 3261896.

Almost surely, 2^18628664066 is an apocalyptic number.

18628664066 is a deficient number, since it is larger than the sum of its proper divisors (9333890554).

18628664066 is a wasteful number, since it uses less digits than its factorization.

18628664066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6519508.

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 18628664066 in words is "eighteen billion, six hundred twenty-eight million, six hundred sixty-four thousand, sixty-six".