12206715509 has 4 divisors (see below), whose sum is σ = 12849174240. Its totient is φ = 11564256780.

The previous prime is 12206715449. The next prime is 12206715533. The reversal of 12206715509 is 90551760221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90551760221 = 13 ⋅6965520017.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12206715509 is a prime.

It is a super-2 number, since 2×12206715509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12206711509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321229337 + ... + 321229374.

It is an arithmetic number, because the mean of its divisors is an integer number (3212293560).

Almost surely, 2^12206715509 is an apocalyptic number.

12206715509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12206715509 is a deficient number, since it is larger than the sum of its proper divisors (642458731).

12206715509 is an equidigital number, since it uses as much as digits as its factorization.

12206715509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642458730.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 12206715509 in words is "twelve billion, two hundred six million, seven hundred fifteen thousand, five hundred nine".