679986669 has 4 divisors (see below), whose sum is σ = 906648896. Its totient is φ = 453324444.

The previous prime is 679986617. The next prime is 679986679. The reversal of 679986669 is 966689976.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 679986669 - 2¹³ = 679978477 is a prime.

It is a super-2 number, since 2×679986669² = 924763740035431122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679986679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113331109 + ... + 113331114.

It is an arithmetic number, because the mean of its divisors is an integer number (226662224).

Almost surely, 2^679986669 is an apocalyptic number.

It is an amenable number.

679986669 is a deficient number, since it is larger than the sum of its proper divisors (226662227).

679986669 is a wasteful number, since it uses less digits than its factorization.

679986669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226662226.

The product of its digits is 52907904, while the sum is 66.

The square root of 679986669 is about 26076.5540093012. The cubic root of 679986669 is about 879.3601879101.

The spelling of 679986669 in words is "six hundred seventy-nine million, nine hundred eighty-six thousand, six hundred sixty-nine".