196561847520 has 144 divisors (see below), whose sum is σ = 674515492560. Its totient is φ = 52123594752.

The previous prime is 196561847519. The next prime is 196561847533. The reversal of 196561847520 is 25748165691.

It is a happy number.

196561847520 is a `hidden beast` number, since 1 + 9 + 6 + 561 + 8 + 4 + 75 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123529 + ... + 639048.

It is an arithmetic number, because the mean of its divisors is an integer number (4684135365).

Almost surely, 2^196561847520 is an apocalyptic number.

196561847520 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 196561847520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337257746280).

196561847520 is an abundant number, since it is smaller than the sum of its proper divisors (477953645040).

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

196561847520 is a wasteful number, since it uses less digits than its factorization.

196561847520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762777 (or 762766 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 196561847520 in words is "one hundred ninety-six billion, five hundred sixty-one million, eight hundred forty-seven thousand, five hundred twenty".