12156352109 has 16 divisors (see below), whose sum is σ = 13936655040. Its totient is φ = 10502472960.

The previous prime is 12156352007. The next prime is 12156352123. The reversal of 12156352109 is 90125365121.

It is a cyclic number.

It is not a de Polignac number, because 12156352109 - 2²⁰ = 12155303533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156352309) 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, 329804 + ... + 364805.

It is an arithmetic number, because the mean of its divisors is an integer number (871040940).

Almost surely, 2^12156352109 is an apocalyptic number.

It is an amenable number.

12156352109 is a deficient number, since it is larger than the sum of its proper divisors (1780302931).

12156352109 is a wasteful number, since it uses less digits than its factorization.

12156352109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694700.

The product of its (nonzero) digits is 16200, while the sum is 35.

The spelling of 12156352109 in words is "twelve billion, one hundred fifty-six million, three hundred fifty-two thousand, one hundred nine".