12611664617 has 8 divisors (see below), whose sum is σ = 12916232616. Its totient is φ = 12310659072.

The previous prime is 12611664613. The next prime is 12611664631. The reversal of 12611664617 is 71646611621.

It can be written as a sum of positive squares in 4 ways, for example, as 2861287081 + 9750377536 = 53491^2 + 98744^2 .

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 12611664617 - 2² = 12611664613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12611664613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883448 + ... + 897609.

It is an arithmetic number, because the mean of its divisors is an integer number (1614529077).

Almost surely, 2^12611664617 is an apocalyptic number.

It is an amenable number.

12611664617 is a deficient number, since it is larger than the sum of its proper divisors (304567999).

12611664617 is an equidigital number, since it uses as much as digits as its factorization.

12611664617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781227.

The product of its digits is 72576, while the sum is 41.

The spelling of 12611664617 in words is "twelve billion, six hundred eleven million, six hundred sixty-four thousand, six hundred seventeen".