12897823805 has 8 divisors (see below), whose sum is σ = 16011091800. Its totient is φ = 9962456896.

The previous prime is 12897823769. The next prime is 12897823817. The reversal of 12897823805 is 50832879821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 37810201 + 12860013604 = 6149^2 + 113402^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12897823805 - 2³⁰ = 11824081981 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44475110 + ... + 44475399.

It is an arithmetic number, because the mean of its divisors is an integer number (2001386475).

Almost surely, 2^12897823805 is an apocalyptic number.

It is an amenable number.

12897823805 is a deficient number, since it is larger than the sum of its proper divisors (3113267995).

12897823805 is an equidigital number, since it uses as much as digits as its factorization.

12897823805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88950543.

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 12897823805 in words is "twelve billion, eight hundred ninety-seven million, eight hundred twenty-three thousand, eight hundred five".