18891128026 has 8 divisors (see below), whose sum is σ = 28337467860. Its totient is φ = 9445305408.

The previous prime is 18891127987. The next prime is 18891128041. The reversal of 18891128026 is 62082119881.

It is a happy number.

It is a Cunningham number, because it is equal to 137445²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 18891128025 + 1 = 137445^2 + 1^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19261 + ... + 195328.

Almost surely, 2^18891128026 is an apocalyptic number.

18891128026 is a deficient number, since it is larger than the sum of its proper divisors (9446339834).

18891128026 is a wasteful number, since it uses less digits than its factorization.

18891128026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258608.

The product of its (nonzero) digits is 110592, while the sum is 46.

The spelling of 18891128026 in words is "eighteen billion, eight hundred ninety-one million, one hundred twenty-eight thousand, twenty-six".