1818196985 has 8 divisors (see below), whose sum is σ = 2380185216. Its totient is φ = 1322325040.

The previous prime is 1818196979. The next prime is 1818196987. The reversal of 1818196985 is 5896918181.

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

It is not a de Polignac number, because 1818196985 - 2¹² = 1818192889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1818196985.

It is not an unprimeable number, because it can be changed into a prime (1818196987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16529009 + ... + 16529118.

It is an arithmetic number, because the mean of its divisors is an integer number (297523152).

Almost surely, 2^1818196985 is an apocalyptic number.

It is an amenable number.

1818196985 is a deficient number, since it is larger than the sum of its proper divisors (561988231).

1818196985 is a wasteful number, since it uses less digits than its factorization.

1818196985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33058143.

The product of its digits is 1244160, while the sum is 56.

The square root of 1818196985 is about 42640.3211174588. The cubic root of 1818196985 is about 1220.5258382252.

It can be divided in two parts, 1818196 and 985, that added together give a palindrome (1819181).

The spelling of 1818196985 in words is "one billion, eight hundred eighteen million, one hundred ninety-six thousand, nine hundred eighty-five".