18120698450 has 12 divisors (see below), whose sum is σ = 33704499210. Its totient is φ = 7248279360.

The previous prime is 18120698441. The next prime is 18120698473. The reversal of 18120698450 is 5489602181.

It can be written as a sum of positive squares in 3 ways, for example, as 13301700889 + 4818997561 = 115333^2 + 69419^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 181206935 + ... + 181207034.

Almost surely, 2^18120698450 is an apocalyptic number.

18120698450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18120698450 is a deficient number, since it is larger than the sum of its proper divisors (15583800760).

18120698450 is a wasteful number, since it uses less digits than its factorization.

18120698450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362413981 (or 362413976 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 18120698450 in words is "eighteen billion, one hundred twenty million, six hundred ninety-eight thousand, four hundred fifty".