18198380826 has 12 divisors (see below), whose sum is σ = 39429825162. Its totient is φ = 6066126936.

The previous prime is 18198380807. The next prime is 18198380831. The reversal of 18198380826 is 62808389181.

18198380826 is a `hidden beast` number, since 181 + 9 + 8 + 380 + 82 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16231014801 + 1967366025 = 127401^2 + 44355^2 .

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, 505510561 + ... + 505510596.

Almost surely, 2^18198380826 is an apocalyptic number.

18198380826 is an abundant number, since it is smaller than the sum of its proper divisors (21231444336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18198380826 is a wasteful number, since it uses less digits than its factorization.

18198380826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011021165 (or 1011021162 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 18198380826 in words is "eighteen billion, one hundred ninety-eight million, three hundred eighty thousand, eight hundred twenty-six".