12860928557 has 4 divisors (see below), whose sum is σ = 12893990460. Its totient is φ = 12827866656.

The previous prime is 12860928529. The next prime is 12860928581. The reversal of 12860928557 is 75582906821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8119091236 + 4741837321 = 90106^2 + 68861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12860928557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12860928499 and 12860928508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12860925557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16530368 + ... + 16531145.

It is an arithmetic number, because the mean of its divisors is an integer number (3223497615).

Almost surely, 2^12860928557 is an apocalyptic number.

It is an amenable number.

12860928557 is a deficient number, since it is larger than the sum of its proper divisors (33061903).

12860928557 is an equidigital number, since it uses as much as digits as its factorization.

12860928557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33061902.

The product of its (nonzero) digits is 2419200, while the sum is 53.

The spelling of 12860928557 in words is "twelve billion, eight hundred sixty million, nine hundred twenty-eight thousand, five hundred fifty-seven".