9661961690 has 32 divisors (see below), whose sum is σ = 17481070080. Its totient is φ = 3844940224.

The previous prime is 9661961689. The next prime is 9661961707. The reversal of 9661961690 is 961691669.

It is a super-2 number, since 2×9661961690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1659224 + ... + 1665036.

It is an arithmetic number, because the mean of its divisors is an integer number (546283440).

Almost surely, 2^9661961690 is an apocalyptic number.

9661961690 is a deficient number, since it is larger than the sum of its proper divisors (7819108390).

9661961690 is a wasteful number, since it uses less digits than its factorization.

9661961690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6646.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 9661961690 is about 98295.2780656324. The cubic root of 9661961690 is about 2129.8798443685.

The spelling of 9661961690 in words is "nine billion, six hundred sixty-one million, nine hundred sixty-one thousand, six hundred ninety".