18603043978409 has 32 divisors (see below), whose sum is σ = 21426249600000. Its totient is φ = 15973845192000.

The previous prime is 18603043978399. The next prime is 18603043978427. The reversal of 18603043978409 is 90487934030681.

It is a cyclic number.

It is not a de Polignac number, because 18603043978409 - 2³⁶ = 18534324501673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18603043978109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1072151084 + ... + 1072168434.

It is an arithmetic number, because the mean of its divisors is an integer number (669570300000).

Almost surely, 2^{18603043978409} is an apocalyptic number.

18603043978409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18603043978409 is a deficient number, since it is larger than the sum of its proper divisors (2823205621591).

18603043978409 is a wasteful number, since it uses less digits than its factorization.

18603043978409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32429.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 18603043978409 in words is "eighteen trillion, six hundred three billion, forty-three million, nine hundred seventy-eight thousand, four hundred nine".