679521333940 has 12 divisors (see below), whose sum is σ = 1426994801316. Its totient is φ = 271808533568.

The previous prime is 679521333913. The next prime is 679521333947. The reversal of 679521333940 is 49333125976.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 110604135184 + 568917198756 = 332572^2 + 754266^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679521333947) 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, 16988033329 + ... + 16988033368.

It is an arithmetic number, because the mean of its divisors is an integer number (118916233443).

Almost surely, 2^679521333940 is an apocalyptic number.

It is an amenable number.

679521333940 is an abundant number, since it is smaller than the sum of its proper divisors (747473467376).

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

679521333940 is a wasteful number, since it uses less digits than its factorization.

679521333940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33976066706 (or 33976066704 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 52.

The spelling of 679521333940 in words is "six hundred seventy-nine billion, five hundred twenty-one million, three hundred thirty-three thousand, nine hundred forty".