9666591850 has 48 divisors (see below), whose sum is σ = 19064904768. Its totient is φ = 3633949440.

The previous prime is 9666591839. The next prime is 9666591887. The reversal of 9666591850 is 581956669.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9666591791 and 9666591800.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 610129 + ... + 625771.

It is an arithmetic number, because the mean of its divisors is an integer number (397185516).

Almost surely, 2^9666591850 is an apocalyptic number.

9666591850 is a deficient number, since it is larger than the sum of its proper divisors (9398312918).

9666591850 is a wasteful number, since it uses less digits than its factorization.

9666591850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16399 (or 16394 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 55.

The square root of 9666591850 is about 98318.8275458978. The cubic root of 9666591850 is about 2130.2200137153.

The spelling of 9666591850 in words is "nine billion, six hundred sixty-six million, five hundred ninety-one thousand, eight hundred fifty".