12805991291949 has 8 divisors (see below), whose sum is σ = 17234231271840. Its totient is φ = 8457539420016.

The previous prime is 12805991291921. The next prime is 12805991291969. The reversal of 12805991291949 is 94919219950821.

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

It is not a de Polignac number, because 12805991291949 - 2⁸ = 12805991291693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12805991291969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19947026614 + ... + 19947027255.

It is an arithmetic number, because the mean of its divisors is an integer number (2154278908980).

Almost surely, 2^{12805991291949} is an apocalyptic number.

It is an amenable number.

12805991291949 is a deficient number, since it is larger than the sum of its proper divisors (4428239979891).

12805991291949 is a wasteful number, since it uses less digits than its factorization.

12805991291949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39894053979.

The product of its (nonzero) digits is 37791360, while the sum is 69.

The spelling of 12805991291949 in words is "twelve trillion, eight hundred five billion, nine hundred ninety-one million, two hundred ninety-one thousand, nine hundred forty-nine".