16561151412 has 192 divisors, whose sum is σ = 44842291200. Its totient is φ = 4714744320.

The previous prime is 16561151407. The next prime is 16561151413. The reversal of 16561151412 is 21415116561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561151413) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25054362 + ... + 25055022.

It is an arithmetic number, because the mean of its divisors is an integer number (233553600).

Almost surely, 2^16561151412 is an apocalyptic number.

16561151412 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 16561151412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22421145600).

16561151412 is an abundant number, since it is smaller than the sum of its proper divisors (28281139788).

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

16561151412 is a wasteful number, since it uses less digits than its factorization.

16561151412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 884 counting only the distinct ones).

The product of its digits is 7200, while the sum is 33.

Adding to 16561151412 its reverse (21415116561), we get a palindrome (37976267973).

The spelling of 16561151412 in words is "sixteen billion, five hundred sixty-one million, one hundred fifty-one thousand, four hundred twelve".