16520109312 has 540 divisors, whose sum is σ = 56244797056. Its totient is φ = 4299079680.

The previous prime is 16520109293. The next prime is 16520109337. The reversal of 16520109312 is 21390102561.

It is a super-2 number, since 2×16520109312² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16520109312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 532906737 + ... + 532906767.

Almost surely, 2^16520109312 is an apocalyptic number.

16520109312 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 16520109312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28122398528).

16520109312 is an abundant number, since it is smaller than the sum of its proper divisors (39724687744).

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

16520109312 is an frugal number, since it uses more digits than its factorization.

16520109312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The spelling of 16520109312 in words is "sixteen billion, five hundred twenty million, one hundred nine thousand, three hundred twelve".