11531368408 has 64 divisors (see below), whose sum is σ = 25851571200. Its totient is φ = 4718849280.

The previous prime is 11531368363. The next prime is 11531368427. The reversal of 11531368408 is 80486313511.

It is a happy number.

It is a super-2 number, since 2×11531368408² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54483 + ... + 161341.

It is an arithmetic number, because the mean of its divisors is an integer number (403930800).

Almost surely, 2^11531368408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11531368408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12925785600).

11531368408 is an abundant number, since it is smaller than the sum of its proper divisors (14320202792).

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

11531368408 is a wasteful number, since it uses less digits than its factorization.

11531368408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106960 (or 106956 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 11531368408 in words is "eleven billion, five hundred thirty-one million, three hundred sixty-eight thousand, four hundred eight".