668056205442 has 32 divisors (see below), whose sum is σ = 1408337452800. Its totient is φ = 210679617168.

The previous prime is 668056205429. The next prime is 668056205459. The reversal of 668056205442 is 244502650866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 668056205391 and 668056205400.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3880668 + ... + 4049159.

It is an arithmetic number, because the mean of its divisors is an integer number (44010545400).

Almost surely, 2^668056205442 is an apocalyptic number.

668056205442 is an abundant number, since it is smaller than the sum of its proper divisors (740281247358).

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

668056205442 is a wasteful number, since it uses less digits than its factorization.

668056205442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7930590.

The product of its (nonzero) digits is 2764800, while the sum is 48.

The spelling of 668056205442 in words is "six hundred sixty-eight billion, fifty-six million, two hundred five thousand, four hundred forty-two".