12611516657 has 8 divisors (see below), whose sum is σ = 13401582696. Its totient is φ = 11826807552.

The previous prime is 12611516651. The next prime is 12611516669. The reversal of 12611516657 is 75661511621.

It can be written as a sum of positive squares in 4 ways, for example, as 6739216 + 12604777441 = 2596^2 + 112271^2 .

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 12611516657 - 2⁴ = 12611516641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12611516651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1334378 + ... + 1343795.

It is an arithmetic number, because the mean of its divisors is an integer number (1675197837).

Almost surely, 2^12611516657 is an apocalyptic number.

12611516657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12611516657 is a deficient number, since it is larger than the sum of its proper divisors (790066039).

12611516657 is a wasteful number, since it uses less digits than its factorization.

12611516657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678467.

The product of its digits is 75600, while the sum is 41.

The spelling of 12611516657 in words is "twelve billion, six hundred eleven million, five hundred sixteen thousand, six hundred fifty-seven".