12091366509 has 16 divisors (see below), whose sum is σ = 16972684800. Its totient is φ = 7635596976.

The previous prime is 12091366489. The next prime is 12091366531. The reversal of 12091366509 is 90566319021.

It is not a de Polignac number, because 12091366509 - 2⁸ = 12091366253 is a prime.

It is a super-2 number, since 2×12091366509² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12091366579) 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, 731862 + ... + 748200.

It is an arithmetic number, because the mean of its divisors is an integer number (1060792800).

Almost surely, 2^12091366509 is an apocalyptic number.

12091366509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12091366509 is a deficient number, since it is larger than the sum of its proper divisors (4881318291).

12091366509 is a wasteful number, since it uses less digits than its factorization.

12091366509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29344.

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 12091366509 in words is "twelve billion, ninety-one million, three hundred sixty-six thousand, five hundred nine".