11581433838 has 64 divisors (see below), whose sum is σ = 29346649920. Its totient is φ = 3353895936.

The previous prime is 11581433833. The next prime is 11581433849. The reversal of 11581433838 is 83833418511.

It is a happy number.

11581433838 is a `hidden beast` number, since 1 + 1 + 581 + 4 + 3 + 38 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 11581433793 and 11581433802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11581433833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473295 + ... + 497162.

It is an arithmetic number, because the mean of its divisors is an integer number (458541405).

Almost surely, 2^11581433838 is an apocalyptic number.

11581433838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11581433838 is an abundant number, since it is smaller than the sum of its proper divisors (17765216082).

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

11581433838 is a wasteful number, since it uses less digits than its factorization.

11581433838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970498 (or 970492 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 11581433838 in words is "eleven billion, five hundred eighty-one million, four hundred thirty-three thousand, eight hundred thirty-eight".