679861205442 has 32 divisors (see below), whose sum is σ = 1539308396160. Its totient is φ = 222344544240.

The previous prime is 679861205399. The next prime is 679861205449. The reversal of 679861205442 is 244502168976.

679861205442 is a `hidden beast` number, since 6 + 7 + 9 + 86 + 12 + 0 + 544 + 2 = 666.

679861205442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×679861205442² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (679861205449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118770934 + ... + 118776657.

It is an arithmetic number, because the mean of its divisors is an integer number (48103387380).

Almost surely, 2^679861205442 is an apocalyptic number.

679861205442 is an abundant number, since it is smaller than the sum of its proper divisors (859447190718).

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

679861205442 is a wasteful number, since it uses less digits than its factorization.

679861205442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237547655 (or 237547649 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 679861205442 in words is "six hundred seventy-nine billion, eight hundred sixty-one million, two hundred five thousand, four hundred forty-two".