15661324441200 has 240 divisors, whose sum is σ = 50327874444800. Its totient is φ = 4163096217600.

The previous prime is 15661324441183. The next prime is 15661324441207. The reversal of 15661324441200 is 214442316651.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661324441207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 716066265 + ... + 716088135.

Almost surely, 2^{15661324441200} is an apocalyptic number.

15661324441200 is a gapful number since it is divisible by the number (10) 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 15661324441200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25163937222400).

15661324441200 is an abundant number, since it is smaller than the sum of its proper divisors (34666550003600).

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

15661324441200 is a wasteful number, since it uses less digits than its factorization.

15661324441200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23760 (or 23749 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

Adding to 15661324441200 its reverse (214442316651), we get a palindrome (15875766757851).

The spelling of 15661324441200 in words is "fifteen trillion, six hundred sixty-one billion, three hundred twenty-four million, four hundred forty-one thousand, two hundred".