12816665869 has 4 divisors (see below), whose sum is σ = 14647618144. Its totient is φ = 10985713596.

The previous prime is 12816665867. The next prime is 12816665881. The reversal of 12816665869 is 96856661821.

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.

It is a cyclic number.

It is not a de Polignac number, because 12816665869 - 2¹ = 12816665867 is a prime.

It is a super-2 number, since 2×12816665869² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12816665861) 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, 915476127 + ... + 915476140.

It is an arithmetic number, because the mean of its divisors is an integer number (3661904536).

Almost surely, 2^12816665869 is an apocalyptic number.

It is an amenable number.

12816665869 is a deficient number, since it is larger than the sum of its proper divisors (1830952275).

12816665869 is an equidigital number, since it uses as much as digits as its factorization.

12816665869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830952274.

The product of its digits is 7464960, while the sum is 58.

The spelling of 12816665869 in words is "twelve billion, eight hundred sixteen million, six hundred sixty-five thousand, eight hundred sixty-nine".