6521551016 has 32 divisors (see below), whose sum is σ = 12951009000. Its totient is φ = 3068061696.

The previous prime is 6521551009. The next prime is 6521551039. The reversal of 6521551016 is 6101551256.

It can be written as a sum of positive squares in 4 ways, for example, as 6391362916 + 130188100 = 79946^2 + 11410^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769490 + ... + 777918.

Almost surely, 2^6521551016 is an apocalyptic number.

It is an amenable number.

6521551016 is a deficient number, since it is larger than the sum of its proper divisors (6429457984).

6521551016 is a wasteful number, since it uses less digits than its factorization.

6521551016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14141 (or 14137 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 6521551016 is about 80756.1206101432. The cubic root of 6521551016 is about 1868.3158520240.

The spelling of 6521551016 in words is "six billion, five hundred twenty-one million, five hundred fifty-one thousand, sixteen".