6538997707 has 4 divisors (see below), whose sum is σ = 7133452056. Its totient is φ = 5944543360.

The previous prime is 6538997677. The next prime is 6538997767. The reversal of 6538997707 is 7077998356.

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

It is a cyclic number.

It is not a de Polignac number, because 6538997707 - 2⁷ = 6538997579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6538997767) 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, 297227158 + ... + 297227179.

It is an arithmetic number, because the mean of its divisors is an integer number (1783363014).

Almost surely, 2^6538997707 is an apocalyptic number.

6538997707 is a deficient number, since it is larger than the sum of its proper divisors (594454349).

6538997707 is a wasteful number, since it uses less digits than its factorization.

6538997707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594454348.

The product of its (nonzero) digits is 20003760, while the sum is 61.

The square root of 6538997707 is about 80864.0693200633. The cubic root of 6538997707 is about 1869.9804307483.

The spelling of 6538997707 in words is "six billion, five hundred thirty-eight million, nine hundred ninety-seven thousand, seven hundred seven".