6528817138 has 4 divisors (see below), whose sum is σ = 9793225710. Its totient is φ = 3264408568.

The previous prime is 6528817133. The next prime is 6528817147. The reversal of 6528817138 is 8317188256.

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

It can be written as a sum of positive squares in only one way, i.e., 5548313169 + 980503969 = 74487^2 + 31313^2 .

It is a super-2 number, since 2×6528817138² = 85250906442885022088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 6528817091 and 6528817100.

It is not an unprimeable number, because it can be changed into a prime (6528817133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1632204283 + ... + 1632204286.

Almost surely, 2^6528817138 is an apocalyptic number.

6528817138 is a deficient number, since it is larger than the sum of its proper divisors (3264408572).

6528817138 is a wasteful number, since it uses less digits than its factorization.

6528817138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264408571.

The product of its digits is 645120, while the sum is 49.

The square root of 6528817138 is about 80801.0961435549. The cubic root of 6528817138 is about 1869.0094688352.

The spelling of 6528817138 in words is "six billion, five hundred twenty-eight million, eight hundred seventeen thousand, one hundred thirty-eight".