11812557834 has 128 divisors (see below), whose sum is σ = 33189212160. Its totient is φ = 3024907200.

The previous prime is 11812557817. The next prime is 11812557839. The reversal of 11812557834 is 43875521811.

11812557834 is a `hidden beast` number, since 1 + 1 + 8 + 12 + 557 + 83 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 11812557834.

It is not an unprimeable number, because it can be changed into a prime (11812557839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 275212 + ... + 315224.

It is an arithmetic number, because the mean of its divisors is an integer number (259290720).

Almost surely, 2^11812557834 is an apocalyptic number.

11812557834 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11812557834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16594606080).

11812557834 is an abundant number, since it is smaller than the sum of its proper divisors (21376654326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11812557834 is a wasteful number, since it uses less digits than its factorization.

11812557834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40113 (or 40107 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The spelling of 11812557834 in words is "eleven billion, eight hundred twelve million, five hundred fifty-seven thousand, eight hundred thirty-four".