9661025351898 has 128 divisors (see below), whose sum is σ = 21809813760000. Its totient is φ = 3169527495552.

The previous prime is 9661025351833. The next prime is 9661025351927. The reversal of 9661025351898 is 8981535201669.

9661025351898 is a `hidden beast` number, since 9 + 6 + 6 + 1 + 0 + 2 + 535 + 1 + 8 + 98 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1519264843 + ... + 1519271201.

It is an arithmetic number, because the mean of its divisors is an integer number (170389170000).

Almost surely, 2^{9661025351898} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9661025351898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10904906880000).

9661025351898 is an abundant number, since it is smaller than the sum of its proper divisors (12148788408102).

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

9661025351898 is a wasteful number, since it uses less digits than its factorization.

9661025351898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7681 (or 7675 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 63.

Adding to 9661025351898 its sum of digits (63), we get a square (9661025351961 = 3108219²).

The spelling of 9661025351898 in words is "nine trillion, six hundred sixty-one billion, twenty-five million, three hundred fifty-one thousand, eight hundred ninety-eight".