18668144458 has 4 divisors (see below), whose sum is σ = 28002216690. Its totient is φ = 9334072228.

The previous prime is 18668144447. The next prime is 18668144489. The reversal of 18668144458 is 85444186681.

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., 17555455009 + 1112689449 = 132497^2 + 33357^2 .

It is a super-4 number, since 4×18668144458⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 18668144399 and 18668144408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4667036113 + ... + 4667036116.

Almost surely, 2^18668144458 is an apocalyptic number.

18668144458 is a deficient number, since it is larger than the sum of its proper divisors (9334072232).

18668144458 is an equidigital number, since it uses as much as digits as its factorization.

18668144458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9334072231.

The product of its digits is 5898240, while the sum is 55.

The spelling of 18668144458 in words is "eighteen billion, six hundred sixty-eight million, one hundred forty-four thousand, four hundred fifty-eight".