679724543105 has 4 divisors (see below), whose sum is σ = 815669451732. Its totient is φ = 543779634480.

The previous prime is 679724543093. The next prime is 679724543119. The reversal of 679724543105 is 501345427976.

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 127306953601 + 552417589504 = 356801^2 + 743248^2 .

It is not a de Polignac number, because 679724543105 - 2¹⁴ = 679724526721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 67972454306 + ... + 67972454315.

It is an arithmetic number, because the mean of its divisors is an integer number (203917362933).

Almost surely, 2^679724543105 is an apocalyptic number.

It is an amenable number.

679724543105 is a deficient number, since it is larger than the sum of its proper divisors (135944908627).

679724543105 is a wasteful number, since it uses less digits than its factorization.

679724543105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135944908626.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 679724543105 in words is "six hundred seventy-nine billion, seven hundred twenty-four million, five hundred forty-three thousand, one hundred five".