679005678445 has 4 divisors (see below), whose sum is σ = 814806814140. Its totient is φ = 543204542752.

The previous prime is 679005678427. The next prime is 679005678479. The reversal of 679005678445 is 544876500976.

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 155637351081 + 523368327364 = 394509^2 + 723442^2 .

It is a cyclic number.

It is not a de Polignac number, because 679005678445 - 2¹⁷ = 679005547373 is a prime.

It is a super-2 number, since 2×679005678445² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67900567840 + ... + 67900567849.

It is an arithmetic number, because the mean of its divisors is an integer number (203701703535).

Almost surely, 2^679005678445 is an apocalyptic number.

It is an amenable number.

679005678445 is a deficient number, since it is larger than the sum of its proper divisors (135801135695).

679005678445 is a wasteful number, since it uses less digits than its factorization.

679005678445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135801135694.

The product of its (nonzero) digits is 50803200, while the sum is 61.

The spelling of 679005678445 in words is "six hundred seventy-nine billion, five million, six hundred seventy-eight thousand, four hundred forty-five".