12805454690781 has 8 divisors (see below), whose sum is σ = 17075631624864. Its totient is φ = 8536123775280.

The previous prime is 12805454690767. The next prime is 12805454690789. The reversal of 12805454690781 is 18709645450821.

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

It is not a de Polignac number, because 12805454690781 - 2⁷ = 12805454690653 is a prime.

It is a super-2 number, since 2×12805454690781² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12805454690789) 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, 211469326 + ... + 211529871.

It is an arithmetic number, because the mean of its divisors is an integer number (2134453953108).

Almost surely, 2^{12805454690781} is an apocalyptic number.

It is an amenable number.

12805454690781 is a deficient number, since it is larger than the sum of its proper divisors (4270176934083).

12805454690781 is a wasteful number, since it uses less digits than its factorization.

12805454690781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423009291.

The product of its (nonzero) digits is 19353600, while the sum is 60.

The spelling of 12805454690781 in words is "twelve trillion, eight hundred five billion, four hundred fifty-four million, six hundred ninety thousand, seven hundred eighty-one".