11878421408647 has 4 divisors (see below), whose sum is σ = 11879579950200. Its totient is φ = 11877262867096.

The previous prime is 11878421408611. The next prime is 11878421408669. The reversal of 11878421408647 is 74680412487811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11878421408647 is a prime.

It is a super-2 number, since 2×11878421408647² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11878421408747) 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 3 ways as a sum of consecutive naturals, for example, 579255397 + ... + 579275902.

It is an arithmetic number, because the mean of its divisors is an integer number (2969894987550).

Almost surely, 2^{11878421408647} is an apocalyptic number.

11878421408647 is a deficient number, since it is larger than the sum of its proper divisors (1158541553).

11878421408647 is a wasteful number, since it uses less digits than its factorization.

11878421408647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158541552.

The product of its (nonzero) digits is 19267584, while the sum is 61.

The spelling of 11878421408647 in words is "eleven trillion, eight hundred seventy-eight billion, four hundred twenty-one million, four hundred eight thousand, six hundred forty-seven".