18403641178909 has 16 divisors (see below), whose sum is σ = 21152444457600. Its totient is φ = 15684784242624.

The previous prime is 18403641178831. The next prime is 18403641179029. The reversal of 18403641178909 is 90987114630481.

It is not a de Polignac number, because 18403641178909 - 2¹⁵ = 18403641146141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18403641178709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11302459 + ... + 12827815.

It is an arithmetic number, because the mean of its divisors is an integer number (1322027778600).

Almost surely, 2^{18403641178909} is an apocalyptic number.

It is an amenable number.

18403641178909 is a deficient number, since it is larger than the sum of its proper divisors (2748803278691).

18403641178909 is a wasteful number, since it uses less digits than its factorization.

18403641178909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535172.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 18403641178909 in words is "eighteen trillion, four hundred three billion, six hundred forty-one million, one hundred seventy-eight thousand, nine hundred nine".