669679013 has 4 divisors (see below), whose sum is σ = 671316780. Its totient is φ = 668041248.

The previous prime is 669679007. The next prime is 669679039. The reversal of 669679013 is 310976966.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 481934209 + 187744804 = 21953^2 + 13702^2 .

It is a cyclic number.

It is not a de Polignac number, because 669679013 - 2¹⁰ = 669677989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669679093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818270 + ... + 819087.

It is an arithmetic number, because the mean of its divisors is an integer number (167829195).

Almost surely, 2^669679013 is an apocalyptic number.

It is an amenable number.

669679013 is a deficient number, since it is larger than the sum of its proper divisors (1637767).

669679013 is a wasteful number, since it uses less digits than its factorization.

669679013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637766.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 669679013 is about 25878.1570634387. The cubic root of 669679013 is about 874.8942513835.

The spelling of 669679013 in words is "six hundred sixty-nine million, six hundred seventy-nine thousand, thirteen".