12861717657 has 8 divisors (see below), whose sum is σ = 17159823840. Its totient is φ = 8569044960.

The previous prime is 12861717647. The next prime is 12861717719. The reversal of 12861717657 is 75671716821.

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

It is not a de Polignac number, because 12861717657 - 2¹⁵ = 12861684889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12861717607) 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, 1352844 + ... + 1362317.

It is an arithmetic number, because the mean of its divisors is an integer number (2144977980).

Almost surely, 2^12861717657 is an apocalyptic number.

It is an amenable number.

12861717657 is a deficient number, since it is larger than the sum of its proper divisors (4298106183).

12861717657 is a wasteful number, since it uses less digits than its factorization.

12861717657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716743.

The product of its digits is 987840, while the sum is 51.

The spelling of 12861717657 in words is "twelve billion, eight hundred sixty-one million, seven hundred seventeen thousand, six hundred fifty-seven".