642121123326416 has 40 divisors (see below), whose sum is σ = 1277782771329960. Its totient is φ = 312371389592064.

The previous prime is 642121123326359. The next prime is 642121123326491. The reversal of 642121123326416 is 614623321121246.

It can be written as a sum of positive squares in 4 ways, for example, as 160612532890000 + 481508590436416 = 12673300^2 + 21943304^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4973051 + ... + 36179738.

It is an arithmetic number, because the mean of its divisors is an integer number (31944569283249).

Almost surely, 2^{642121123326416} is an apocalyptic number.

It is an amenable number.

642121123326416 is a deficient number, since it is larger than the sum of its proper divisors (635661648003544).

642121123326416 is a wasteful number, since it uses less digits than its factorization.

642121123326416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41179191 (or 41179185 counting only the distinct ones).

The product of its digits is 497664, while the sum is 44.

The spelling of 642121123326416 in words is "six hundred forty-two trillion, one hundred twenty-one billion, one hundred twenty-three million, three hundred twenty-six thousand, four hundred sixteen".