679285555821 has 12 divisors (see below), whose sum is σ = 1032831839520. Its totient is φ = 429022456200.

The previous prime is 679285555799. The next prime is 679285555877. The reversal of 679285555821 is 128555582976.

679285555821 is a `hidden beast` number, since 6 + 7 + 9 + 2 + 8 + 55 + 558 + 21 = 666.

It is not a de Polignac number, because 679285555821 - 2⁵ = 679285555789 is a prime.

It is a super-2 number, since 2×679285555821² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679285556821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1986214905 + ... + 1986215246.

It is an arithmetic number, because the mean of its divisors is an integer number (86069319960).

Almost surely, 2^679285555821 is an apocalyptic number.

It is an amenable number.

679285555821 is a deficient number, since it is larger than the sum of its proper divisors (353546283699).

679285555821 is a wasteful number, since it uses less digits than its factorization.

679285555821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972430176 (or 3972430173 counting only the distinct ones).

The product of its digits is 60480000, while the sum is 63.

The spelling of 679285555821 in words is "six hundred seventy-nine billion, two hundred eighty-five million, five hundred fifty-five thousand, eight hundred twenty-one".