16216515612 has 72 divisors (see below), whose sum is σ = 44764836480. Its totient is φ = 4908978720.

The previous prime is 16216515589. The next prime is 16216515613. The reversal of 16216515612 is 21651561261.

16216515612 is a `hidden beast` number, since 1 + 6 + 21 + 6 + 5 + 15 + 612 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16216515613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 368439 + ... + 410097.

It is an arithmetic number, because the mean of its divisors is an integer number (621733840).

Almost surely, 2^16216515612 is an apocalyptic number.

16216515612 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 16216515612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22382418240).

16216515612 is an abundant number, since it is smaller than the sum of its proper divisors (28548320868).

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

16216515612 is a wasteful number, since it uses less digits than its factorization.

16216515612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42663 (or 42658 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 16216515612 in words is "sixteen billion, two hundred sixteen million, five hundred fifteen thousand, six hundred twelve".