11781425891 has 16 divisors (see below), whose sum is σ = 12215992320. Its totient is φ = 11354656320.

The previous prime is 11781425863. The next prime is 11781425897. The reversal of 11781425891 is 19852418711.

It is a cyclic number.

It is not a de Polignac number, because 11781425891 - 2³⁰ = 10707684067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11781425897) 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 15 ways as a sum of consecutive naturals, for example, 1239740 + ... + 1249206.

It is an arithmetic number, because the mean of its divisors is an integer number (763499520).

Almost surely, 2^11781425891 is an apocalyptic number.

11781425891 is a deficient number, since it is larger than the sum of its proper divisors (434566429).

11781425891 is a wasteful number, since it uses less digits than its factorization.

11781425891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9874.

The product of its digits is 161280, while the sum is 47.

The spelling of 11781425891 in words is "eleven billion, seven hundred eighty-one million, four hundred twenty-five thousand, eight hundred ninety-one".