679166921 has 16 divisors (see below), whose sum is σ = 713836800. Its totient is φ = 645321600.

The previous prime is 679166911. The next prime is 679166923. The reversal of 679166921 is 129661976.

679166921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 679166921 - 2¹⁰ = 679165897 is a prime.

It is a super-3 number, since 3×679166921³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679166923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 698966 + ... + 699936.

It is an arithmetic number, because the mean of its divisors is an integer number (44614800).

Almost surely, 2^679166921 is an apocalyptic number.

It is an amenable number.

679166921 is a deficient number, since it is larger than the sum of its proper divisors (34669879).

679166921 is a wasteful number, since it uses less digits than its factorization.

679166921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360.

The product of its digits is 244944, while the sum is 47.

The square root of 679166921 is about 26060.8311647960. The cubic root of 679166921 is about 879.0066792048.

The spelling of 679166921 in words is "six hundred seventy-nine million, one hundred sixty-six thousand, nine hundred twenty-one".