6438085081 has 4 divisors (see below), whose sum is σ = 6439897600. Its totient is φ = 6436272564.

The previous prime is 6438085061. The next prime is 6438085091. The reversal of 6438085081 is 1805808346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6438085081 is a prime.

It is a super-2 number, since 2×6438085081² = 82897879020389553122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6438085061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900921 + ... + 908038.

It is an arithmetic number, because the mean of its divisors is an integer number (1609974400).

Almost surely, 2^6438085081 is an apocalyptic number.

It is an amenable number.

6438085081 is a deficient number, since it is larger than the sum of its proper divisors (1812519).

6438085081 is a wasteful number, since it uses less digits than its factorization.

6438085081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812518.

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 6438085081 is about 80237.6786865124. The cubic root of 6438085081 is about 1860.3110707424.

The spelling of 6438085081 in words is "six billion, four hundred thirty-eight million, eighty-five thousand, eighty-one".