18811217040 has 160 divisors (see below), whose sum is σ = 72704203776. Its totient is φ = 3908820480.

The previous prime is 18811216993. The next prime is 18811217059. The reversal of 18811217040 is 4071211881.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 18811216992 and 18811217010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 490482 + ... + 527441.

Almost surely, 2^18811217040 is an apocalyptic number.

18811217040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18811217040 is an abundant number, since it is smaller than the sum of its proper divisors (53892986736).

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

18811217040 is a wasteful number, since it uses less digits than its factorization.

18811217040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017957 (or 1017951 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 33.

The spelling of 18811217040 in words is "eighteen billion, eight hundred eleven million, two hundred seventeen thousand, forty".