7891126042689 has 24 divisors (see below), whose sum is σ = 11821282785312. Its totient is φ = 5260381030080.

The previous prime is 7891126042663. The next prime is 7891126042717. The reversal of 7891126042689 is 9862406211987.

7891126042689 is a `hidden beast` number, since 7 + 8 + 9 + 1 + 12 + 604 + 2 + 6 + 8 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-7891126042689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7891126042619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2346222 + ... + 4613784.

It is an arithmetic number, because the mean of its divisors is an integer number (492553449388).

Almost surely, 2^{7891126042689} is an apocalyptic number.

It is an amenable number.

7891126042689 is a deficient number, since it is larger than the sum of its proper divisors (3930156742623).

7891126042689 is a wasteful number, since it uses less digits than its factorization.

7891126042689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281899 (or 2281887 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 7891126042689 in words is "seven trillion, eight hundred ninety-one billion, one hundred twenty-six million, forty-two thousand, six hundred eighty-nine".