6442836008581 has 16 divisors (see below), whose sum is σ = 7379814067200. Its totient is φ = 5510014259328.

The previous prime is 6442836008573. The next prime is 6442836008611. The reversal of 6442836008581 is 1858006382446.

It is a cyclic number.

It is not a de Polignac number, because 6442836008581 - 2³ = 6442836008573 is a prime.

It is a super-2 number, since 2×6442836008581² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6442836008381) 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, 5376780 + ... + 6464938.

It is an arithmetic number, because the mean of its divisors is an integer number (461238379200).

Almost surely, 2^{6442836008581} is an apocalyptic number.

It is an amenable number.

6442836008581 is a deficient number, since it is larger than the sum of its proper divisors (936978058619).

6442836008581 is a wasteful number, since it uses less digits than its factorization.

6442836008581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090068.

The product of its (nonzero) digits is 8847360, while the sum is 55.

The spelling of 6442836008581 in words is "six trillion, four hundred forty-two billion, eight hundred thirty-six million, eight thousand, five hundred eighty-one".