12681587157 has 4 divisors (see below), whose sum is σ = 16908782880. Its totient is φ = 8454391436.

The previous prime is 12681587147. The next prime is 12681587197. The reversal of 12681587157 is 75178518621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75178518621 = 3 ⋅25059506207.

It is a cyclic number.

It is not a de Polignac number, because 12681587157 - 2⁷ = 12681587029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681587147) 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, 2113597857 + ... + 2113597862.

It is an arithmetic number, because the mean of its divisors is an integer number (4227195720).

Almost surely, 2^12681587157 is an apocalyptic number.

It is an amenable number.

12681587157 is a deficient number, since it is larger than the sum of its proper divisors (4227195723).

12681587157 is an equidigital number, since it uses as much as digits as its factorization.

12681587157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4227195722.

The product of its digits is 940800, while the sum is 51.

The spelling of 12681587157 in words is "twelve billion, six hundred eighty-one million, five hundred eighty-seven thousand, one hundred fifty-seven".