679948661 has 8 divisors (see below), whose sum is σ = 777290880. Its totient is φ = 582658128.

The previous prime is 679948651. The next prime is 679948669. The reversal of 679948661 is 166849976.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 679948661 - 2¹⁸ = 679686517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 679948597 and 679948606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679948669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21335 + ... + 42603.

It is an arithmetic number, because the mean of its divisors is an integer number (97161360).

Almost surely, 2^679948661 is an apocalyptic number.

It is an amenable number.

679948661 is a deficient number, since it is larger than the sum of its proper divisors (97342219).

679948661 is a wasteful number, since it uses less digits than its factorization.

679948661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25843.

The product of its digits is 3919104, while the sum is 56.

The square root of 679948661 is about 26075.8252218410. The cubic root of 679948661 is about 879.3438035964.

The spelling of 679948661 in words is "six hundred seventy-nine million, nine hundred forty-eight thousand, six hundred sixty-one".