12528881665 has 8 divisors (see below), whose sum is σ = 15048969408. Its totient is φ = 10013564400.

The previous prime is 12528881653. The next prime is 12528881669. The reversal of 12528881665 is 56618882521.

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

It is not a de Polignac number, because 12528881665 - 2¹⁹ = 12528357377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12528881669) 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, 1186837 + ... + 1197346.

It is an arithmetic number, because the mean of its divisors is an integer number (1881121176).

Almost surely, 2^12528881665 is an apocalyptic number.

It is an amenable number.

12528881665 is a deficient number, since it is larger than the sum of its proper divisors (2520087743).

12528881665 is a wasteful number, since it uses less digits than its factorization.

12528881665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385239.

The product of its digits is 1843200, while the sum is 52.

The spelling of 12528881665 in words is "twelve billion, five hundred twenty-eight million, eight hundred eighty-one thousand, six hundred sixty-five".