12856247661 has 8 divisors (see below), whose sum is σ = 17604951904. Its totient is φ = 8339187600.

The previous prime is 12856247641. The next prime is 12856247689. The reversal of 12856247661 is 16674265821.

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

It is not a de Polignac number, because 12856247661 - 2⁶ = 12856247597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12856247661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12856247641) 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, 57910915 + ... + 57911136.

It is an arithmetic number, because the mean of its divisors is an integer number (2200618988).

Almost surely, 2^12856247661 is an apocalyptic number.

It is an amenable number.

12856247661 is a deficient number, since it is larger than the sum of its proper divisors (4748704243).

12856247661 is a wasteful number, since it uses less digits than its factorization.

12856247661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115822091.

The product of its digits is 967680, while the sum is 48.

The spelling of 12856247661 in words is "twelve billion, eight hundred fifty-six million, two hundred forty-seven thousand, six hundred sixty-one".