12809409945 has 8 divisors (see below), whose sum is σ = 20495055936. Its totient is φ = 6831685296.

The previous prime is 12809409923. The next prime is 12809409961. The reversal of 12809409945 is 54990490821.

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

It is not a de Polignac number, because 12809409945 - 2⁵ = 12809409913 is a prime.

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, 426980317 + ... + 426980346.

It is an arithmetic number, because the mean of its divisors is an integer number (2561881992).

Almost surely, 2^12809409945 is an apocalyptic number.

12809409945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12809409945 is a deficient number, since it is larger than the sum of its proper divisors (7685645991).

12809409945 is an equidigital number, since it uses as much as digits as its factorization.

12809409945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853960671.

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 12809409945 in words is "twelve billion, eight hundred nine million, four hundred nine thousand, nine hundred forty-five".