18080803856 has 20 divisors (see below), whose sum is σ = 35885987004. Its totient is φ = 8819904000.

The previous prime is 18080803843. The next prime is 18080803859. The reversal of 18080803856 is 65830808081.

It can be written as a sum of positive squares in 2 ways, for example, as 1511965456 + 16568838400 = 38884^2 + 128720^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18080803856.

It is not an unprimeable number, because it can be changed into a prime (18080803859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13780445 + ... + 13781756.

Almost surely, 2^18080803856 is an apocalyptic number.

18080803856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18080803856 is a deficient number, since it is larger than the sum of its proper divisors (17805183148).

18080803856 is a wasteful number, since it uses less digits than its factorization.

18080803856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27562250 (or 27562244 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 47.

The spelling of 18080803856 in words is "eighteen billion, eighty million, eight hundred three thousand, eight hundred fifty-six".