6581338132 has 6 divisors (see below), whose sum is σ = 11517341738. Its totient is φ = 3290669064.

The previous prime is 6581338103. The next prime is 6581338139. The reversal of 6581338132 is 2318331856.

It can be written as a sum of positive squares in only one way, i.e., 6569750916 + 11587216 = 81054^2 + 3404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6581338139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822667263 + ... + 822667270.

Almost surely, 2^6581338132 is an apocalyptic number.

It is an amenable number.

6581338132 is a deficient number, since it is larger than the sum of its proper divisors (4936003606).

6581338132 is a wasteful number, since it uses less digits than its factorization.

6581338132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645334537 (or 1645334535 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 6581338132 is about 81125.4468832068. The cubic root of 6581338132 is about 1874.0078312992.

Adding to 6581338132 its reverse (2318331856), we get a palindrome (8899669988).

The spelling of 6581338132 in words is "six billion, five hundred eighty-one million, three hundred thirty-eight thousand, one hundred thirty-two".