679664611840 has 40 divisors (see below), whose sum is σ = 1629602110620. Its totient is φ = 271865843712.

The previous prime is 679664611771. The next prime is 679664611841. The reversal of 679664611840 is 48116466976.

It can be written as a sum of positive squares in 2 ways, for example, as 676315443456 + 3349168384 = 822384^2 + 57872^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (679664611841) 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, 132744435 + ... + 132749554.

Almost surely, 2^679664611840 is an apocalyptic number.

It is an amenable number.

679664611840 is an abundant number, since it is smaller than the sum of its proper divisors (949937498780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

679664611840 is an equidigital number, since it uses as much as digits as its factorization.

679664611840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265494012 (or 265493996 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 679664611840 in words is "six hundred seventy-nine billion, six hundred sixty-four million, six hundred eleven thousand, eight hundred forty".