6511616225 has 12 divisors (see below), whose sum is σ = 8152799616. Its totient is φ = 5158715280.

The previous prime is 6511616213. The next prime is 6511616231. The reversal of 6511616225 is 5226161156.

It is not a de Polignac number, because 6511616225 - 2²⁴ = 6494839009 is a prime.

It is a super-2 number, since 2×6511616225² = 84802291723366501250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1261817 + ... + 1266966.

It is an arithmetic number, because the mean of its divisors is an integer number (679399968).

Almost surely, 2^6511616225 is an apocalyptic number.

It is an amenable number.

6511616225 is a deficient number, since it is larger than the sum of its proper divisors (1641183391).

6511616225 is a wasteful number, since it uses less digits than its factorization.

6511616225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528896 (or 2528891 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 6511616225 is about 80694.5860947313. The cubic root of 6511616225 is about 1867.3666524261.

The spelling of 6511616225 in words is "six billion, five hundred eleven million, six hundred sixteen thousand, two hundred twenty-five".