18216144890 has 8 divisors (see below), whose sum is σ = 32789060820. Its totient is φ = 7286457952.

The previous prime is 18216144889. The next prime is 18216144907. The reversal of 18216144890 is 9844161281.

It can be written as a sum of positive squares in 2 ways, for example, as 17979323569 + 236821321 = 134087^2 + 15389^2 .

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

It is a super-2 number, since 2×18216144890² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910807235 + ... + 910807254.

Almost surely, 2^18216144890 is an apocalyptic number.

18216144890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18216144890 is a deficient number, since it is larger than the sum of its proper divisors (14572915930).

18216144890 is a wasteful number, since it uses less digits than its factorization.

18216144890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821614496.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 18216144890 in words is "eighteen billion, two hundred sixteen million, one hundred forty-four thousand, eight hundred ninety".