6506771538 has 16 divisors (see below), whose sum is σ = 13043602656. Its totient is φ = 2163913920.

The previous prime is 6506771533. The next prime is 6506771549. The reversal of 6506771538 is 8351776056.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6506771533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1249668 + ... + 1254863.

It is an arithmetic number, because the mean of its divisors is an integer number (815225166).

Almost surely, 2^6506771538 is an apocalyptic number.

6506771538 is an abundant number, since it is smaller than the sum of its proper divisors (6536831118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6506771538 is a wasteful number, since it uses less digits than its factorization.

6506771538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504969.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The square root of 6506771538 is about 80664.5618471953. The cubic root of 6506771538 is about 1866.9034263397.

The spelling of 6506771538 in words is "six billion, five hundred six million, seven hundred seventy-one thousand, five hundred thirty-eight".