642066315444 has 72 divisors (see below), whose sum is σ = 1639101656192. Its totient is φ = 211899810240.

The previous prime is 642066315439. The next prime is 642066315491. The reversal of 642066315444 is 444513660246.

642066315444 is a `hidden beast` number, since 6 + 4 + 2 + 0 + 6 + 631 + 5 + 4 + 4 + 4 = 666.

642066315444 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 2×642066315444² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 642066315444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20946009 + ... + 20976639.

Almost surely, 2^642066315444 is an apocalyptic number.

It is an amenable number.

642066315444 is an abundant number, since it is smaller than the sum of its proper divisors (997035340748).

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

642066315444 is a wasteful number, since it uses less digits than its factorization.

642066315444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36397 (or 36392 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 45.

The spelling of 642066315444 in words is "six hundred forty-two billion, sixty-six million, three hundred fifteen thousand, four hundred forty-four".