6507881081 has 4 divisors (see below), whose sum is σ = 7008487332. Its totient is φ = 6007274832.

The previous prime is 6507880979. The next prime is 6507881099. The reversal of 6507881081 is 1801887056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1187491600 + 5320389481 = 34460^2 + 72941^2 .

It is not a de Polignac number, because 6507881081 - 2³⁰ = 5434139257 is a prime.

It is a super-2 number, since 2×6507881081² = 84705032328875457122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6507881381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250303106 + ... + 250303131.

It is an arithmetic number, because the mean of its divisors is an integer number (1752121833).

Almost surely, 2^6507881081 is an apocalyptic number.

It is an amenable number.

6507881081 is a deficient number, since it is larger than the sum of its proper divisors (500606251).

6507881081 is a wasteful number, since it uses less digits than its factorization.

6507881081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500606250.

The product of its (nonzero) digits is 107520, while the sum is 44.

The square root of 6507881081 is about 80671.4390661280. The cubic root of 6507881081 is about 1867.0095358948.

The spelling of 6507881081 in words is "six billion, five hundred seven million, eight hundred eighty-one thousand, eighty-one".