18426667509 has 16 divisors (see below), whose sum is σ = 27441699840. Its totient is φ = 12220125120.

The previous prime is 18426667507. The next prime is 18426667529. The reversal of 18426667509 is 90576662481.

It is not a de Polignac number, because 18426667509 - 2¹ = 18426667507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18426667507) 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, 1781412 + ... + 1791725.

It is an arithmetic number, because the mean of its divisors is an integer number (1715106240).

Almost surely, 2^18426667509 is an apocalyptic number.

It is an amenable number.

18426667509 is a deficient number, since it is larger than the sum of its proper divisors (9015032331).

18426667509 is a wasteful number, since it uses less digits than its factorization.

18426667509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573337 (or 3573331 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 18426667509 in words is "eighteen billion, four hundred twenty-six million, six hundred sixty-seven thousand, five hundred nine".