6617561225 has 24 divisors (see below), whose sum is σ = 9142236288. Its totient is φ = 4710363200.

The previous prime is 6617561207. The next prime is 6617561233. The reversal of 6617561225 is 5221657166.

It is not a de Polignac number, because 6617561225 - 2⁸ = 6617560969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243074 + ... + 268923.

It is an arithmetic number, because the mean of its divisors is an integer number (380926512).

Almost surely, 2^6617561225 is an apocalyptic number.

It is an amenable number.

6617561225 is a deficient number, since it is larger than the sum of its proper divisors (2524675063).

6617561225 is a wasteful number, since it uses less digits than its factorization.

6617561225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512065 (or 512060 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 6617561225 is about 81348.3941144507. The cubic root of 6617561225 is about 1877.4396663124.

The spelling of 6617561225 in words is "six billion, six hundred seventeen million, five hundred sixty-one thousand, two hundred twenty-five".