196661520000 has 1600 divisors, whose sum is σ = 832818412800. Its totient is φ = 45619200000.

The previous prime is 196661519983. The next prime is 196661520007. The reversal of 196661520000 is 25166691.

It is a tau number, because it is divible by the number of its divisors (1600).

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

It is not an unprimeable number, because it can be changed into a prime (196661520007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 199 ways as a sum of consecutive naturals, for example, 2209679956 + ... + 2209680044.

It is an arithmetic number, because the mean of its divisors is an integer number (520511508).

Almost surely, 2^196661520000 is an apocalyptic number.

196661520000 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 196661520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (416409206400).

196661520000 is an abundant number, since it is smaller than the sum of its proper divisors (636156892800).

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

196661520000 is an equidigital number, since it uses as much as digits as its factorization.

196661520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

Adding to 196661520000 its reverse (25166691), we get a palindrome (196686686691).

The spelling of 196661520000 in words is "one hundred ninety-six billion, six hundred sixty-one million, five hundred twenty thousand".