9661651650 has 240 divisors, whose sum is σ = 32486420736. Its totient is φ = 2078369280.

The previous prime is 9661651627. The next prime is 9661651651. The reversal of 9661651650 is 561561669.

9661651650 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 9661651596 and 9661651605.

It is not an unprimeable number, because it can be changed into a prime (9661651651) 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 119 ways as a sum of consecutive naturals, for example, 471927 + ... + 491973.

Almost surely, 2^9661651650 is an apocalyptic number.

9661651650 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9661651650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16243210368).

9661651650 is an abundant number, since it is smaller than the sum of its proper divisors (22824769086).

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

9661651650 is a wasteful number, since it uses less digits than its factorization.

9661651650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20095 (or 20081 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 9661651650 is about 98293.7009680681. The cubic root of 9661651650 is about 2129.8570624176.

The spelling of 9661651650 in words is "nine billion, six hundred sixty-one million, six hundred fifty-one thousand, six hundred fifty".