9681780326436 has 36 divisors (see below), whose sum is σ = 24473529517164. Its totient is φ = 3227241600000.

The previous prime is 9681780326401. The next prime is 9681780326501. The reversal of 9681780326436 is 6346230871869.

9681780326436 is a `hidden beast` number, since 9 + 6 + 8 + 178 + 0 + 3 + 26 + 436 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6429997633536 + 3251782692900 = 2535744^2 + 1803270^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6543436 + ... + 7885436.

Almost surely, 2^{9681780326436} is an apocalyptic number.

It is an amenable number.

9681780326436 is an abundant number, since it is smaller than the sum of its proper divisors (14791749190728).

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

9681780326436 is a wasteful number, since it uses less digits than its factorization.

9681780326436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542412 (or 1542407 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 63.

The spelling of 9681780326436 in words is "nine trillion, six hundred eighty-one billion, seven hundred eighty million, three hundred twenty-six thousand, four hundred thirty-six".