11531304816 has 40 divisors (see below), whose sum is σ = 31541512464. Its totient is φ = 3617664000.

The previous prime is 11531304803. The next prime is 11531304857. The reversal of 11531304816 is 61840313511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7064935 + ... + 7066566.

Almost surely, 2^11531304816 is an apocalyptic number.

11531304816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11531304816 is an abundant number, since it is smaller than the sum of its proper divisors (20010207648).

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

11531304816 is a wasteful number, since it uses less digits than its factorization.

11531304816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14131529 (or 14131523 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 11531304816 in words is "eleven billion, five hundred thirty-one million, three hundred four thousand, eight hundred sixteen".