196663991040 has 864 divisors, whose sum is σ = 775104422400. Its totient is φ = 47180390400.

The previous prime is 196663990981. The next prime is 196663991059. The reversal of 196663991040 is 40199366691.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 547810381 + ... + 547810739.

It is an arithmetic number, because the mean of its divisors is an integer number (897111600).

Almost surely, 2^196663991040 is an apocalyptic number.

196663991040 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 196663991040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387552211200).

196663991040 is an abundant number, since it is smaller than the sum of its proper divisors (578440431360).

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

196663991040 is a wasteful number, since it uses less digits than its factorization.

196663991040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The spelling of 196663991040 in words is "one hundred ninety-six billion, six hundred sixty-three million, nine hundred ninety-one thousand, forty".