4042065604581 has 20 divisors (see below), whose sum is σ = 6232926336384. Its totient is φ = 2607784259400.

The previous prime is 4042065604579. The next prime is 4042065604663. The reversal of 4042065604581 is 1854065602404.

It is a happy number.

4042065604581 is a `hidden beast` number, since 4 + 0 + 4 + 2 + 0 + 6 + 5 + 60 + 4 + 581 = 666.

It is not a de Polignac number, because 4042065604581 - 2¹ = 4042065604579 is a prime.

It is a super-2 number, since 2×4042065604581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042065604531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 804869175 + ... + 804874196.

Almost surely, 2^{4042065604581} is an apocalyptic number.

It is an amenable number.

4042065604581 is a deficient number, since it is larger than the sum of its proper divisors (2190860731803).

4042065604581 is a wasteful number, since it uses less digits than its factorization.

4042065604581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609743414 (or 1609743405 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 4042065604581 in words is "four trillion, forty-two billion, sixty-five million, six hundred four thousand, five hundred eighty-one".