679680438642 has 12 divisors (see below), whose sum is σ = 1472640950430. Its totient is φ = 226560146208.

The previous prime is 679680438617. The next prime is 679680438659. The reversal of 679680438642 is 246834086976.

679680438642 is a `hidden beast` number, since 67 + 9 + 6 + 80 + 438 + 64 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 457112562201 + 222567876441 = 676101^2 + 471771^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 679680438642.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 18880012167 + ... + 18880012202.

Almost surely, 2^679680438642 is an apocalyptic number.

679680438642 is an abundant number, since it is smaller than the sum of its proper divisors (792960511788).

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

679680438642 is a wasteful number, since it uses less digits than its factorization.

679680438642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37760024377 (or 37760024374 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 63.

The spelling of 679680438642 in words is "six hundred seventy-nine billion, six hundred eighty million, four hundred thirty-eight thousand, six hundred forty-two".