9666689155 has 4 divisors (see below), whose sum is σ = 11600026992. Its totient is φ = 7733351320.

The previous prime is 9666689143. The next prime is 9666689191. The reversal of 9666689155 is 5519866669.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9666689155 - 2⁹ = 9666688643 is a prime.

It is a super-2 number, since 2×9666689155² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9666689093 and 9666689102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966668911 + ... + 966668920.

It is an arithmetic number, because the mean of its divisors is an integer number (2900006748).

Almost surely, 2^9666689155 is an apocalyptic number.

9666689155 is a deficient number, since it is larger than the sum of its proper divisors (1933337837).

9666689155 is a wasteful number, since it uses less digits than its factorization.

9666689155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933337836.

The product of its digits is 20995200, while the sum is 61.

The square root of 9666689155 is about 98319.3223888367. The cubic root of 9666689155 is about 2130.2271613693.

The spelling of 9666689155 in words is "nine billion, six hundred sixty-six million, six hundred eighty-nine thousand, one hundred fifty-five".