12647836509 has 32 divisors (see below), whose sum is σ = 21030865920. Its totient is φ = 6568464000.

The previous prime is 12647836501. The next prime is 12647836517. The reversal of 12647836509 is 90563874621.

It is an interprime number because it is at equal distance from previous prime (12647836501) and next prime (12647836517).

It is not a de Polignac number, because 12647836509 - 2³ = 12647836501 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12647836501) 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, 1300537 + ... + 1310225.

It is an arithmetic number, because the mean of its divisors is an integer number (657214560).

It is a 1-persistent number, because it is pandigital, but 2⋅12647836509 = 25295673018 is not.

Almost surely, 2^12647836509 is an apocalyptic number.

It is an amenable number.

12647836509 is a deficient number, since it is larger than the sum of its proper divisors (8383029411).

12647836509 is a wasteful number, since it uses less digits than its factorization.

12647836509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15361.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 12647836509 in words is "twelve billion, six hundred forty-seven million, eight hundred thirty-six thousand, five hundred nine".