15978161533800 has 192 divisors, whose sum is σ = 52146630259200. Its totient is φ = 4036017888000.

The previous prime is 15978161533727. The next prime is 15978161533823. The reversal of 15978161533800 is 833516187951.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83706067 + ... + 83896733.

It is an arithmetic number, because the mean of its divisors is an integer number (271597032600).

Almost surely, 2^{15978161533800} is an apocalyptic number.

15978161533800 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 15978161533800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26073315129600).

15978161533800 is an abundant number, since it is smaller than the sum of its proper divisors (36168468725400).

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

15978161533800 is a wasteful number, since it uses less digits than its factorization.

15978161533800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198056 (or 198047 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 57.

The spelling of 15978161533800 in words is "fifteen trillion, nine hundred seventy-eight billion, one hundred sixty-one million, five hundred thirty-three thousand, eight hundred".