16531554312 has 144 divisors (see below), whose sum is σ = 55408242240. Its totient is φ = 4359947904.

The previous prime is 16531554287. The next prime is 16531554329. The reversal of 16531554312 is 21345513561.

16531554312 is a `hidden beast` number, since 1 + 65 + 31 + 554 + 3 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11868 + ... + 182219.

It is an arithmetic number, because the mean of its divisors is an integer number (384779460).

Almost surely, 2^16531554312 is an apocalyptic number.

16531554312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16531554312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27704121120).

16531554312 is an abundant number, since it is smaller than the sum of its proper divisors (38876687928).

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

16531554312 is a wasteful number, since it uses less digits than its factorization.

16531554312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194132 (or 194112 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The spelling of 16531554312 in words is "sixteen billion, five hundred thirty-one million, five hundred fifty-four thousand, three hundred twelve".