12156689665 has 8 divisors (see below), whose sum is σ = 14627779200. Its totient is φ = 9698850672.

The previous prime is 12156689653. The next prime is 12156689689. The reversal of 12156689665 is 56698665121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12156689665 - 2¹⁷ = 12156558593 is a prime.

It is a super-2 number, since 2×12156689665² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3310615 + ... + 3314284.

It is an arithmetic number, because the mean of its divisors is an integer number (1828472400).

Almost surely, 2^12156689665 is an apocalyptic number.

It is an amenable number.

12156689665 is a deficient number, since it is larger than the sum of its proper divisors (2471089535).

12156689665 is an equidigital number, since it uses as much as digits as its factorization.

12156689665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6625271.

The product of its digits is 4665600, while the sum is 55.

The spelling of 12156689665 in words is "twelve billion, one hundred fifty-six million, six hundred eighty-nine thousand, six hundred sixty-five".