6521725516 has 24 divisors (see below), whose sum is σ = 11702404224. Its totient is φ = 3178331520.

The previous prime is 6521725489. The next prime is 6521725531. The reversal of 6521725516 is 6155271256.

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, 161061 + ... + 197443.

It is an arithmetic number, because the mean of its divisors is an integer number (487600176).

Almost surely, 2^6521725516 is an apocalyptic number.

It is an amenable number.

6521725516 is a deficient number, since it is larger than the sum of its proper divisors (5180678708).

6521725516 is a wasteful number, since it uses less digits than its factorization.

6521725516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37521 (or 37519 counting only the distinct ones).

The product of its digits is 126000, while the sum is 40.

The square root of 6521725516 is about 80757.2010163800. The cubic root of 6521725516 is about 1868.3325156576.

The spelling of 6521725516 in words is "six billion, five hundred twenty-one million, seven hundred twenty-five thousand, five hundred sixteen".