9666621834 has 16 divisors (see below), whose sum is σ = 19335093120. Its totient is φ = 3221899040.

The previous prime is 9666621829. The next prime is 9666621847. The reversal of 9666621834 is 4381266669.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3747 + ... + 139094.

It is an arithmetic number, because the mean of its divisors is an integer number (1208443320).

Almost surely, 2^9666621834 is an apocalyptic number.

9666621834 is an abundant number, since it is smaller than the sum of its proper divisors (9668471286).

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

9666621834 is a wasteful number, since it uses less digits than its factorization.

9666621834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154125.

The product of its digits is 2239488, while the sum is 51.

The square root of 9666621834 is about 98318.9800292904. The cubic root of 9666621834 is about 2130.2222162306. Note that the first 4 decimals are identical.

The spelling of 9666621834 in words is "nine billion, six hundred sixty-six million, six hundred twenty-one thousand, eight hundred thirty-four".