4891661225 has 12 divisors (see below), whose sum is σ = 6617083920. Its totient is φ = 3557571600.

The previous prime is 4891661221. The next prime is 4891661237. The reversal of 4891661225 is 5221661984.

It is not a de Polignac number, because 4891661225 - 2² = 4891661221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4891661221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8893655 + ... + 8894204.

It is an arithmetic number, because the mean of its divisors is an integer number (551423660).

Almost surely, 2^4891661225 is an apocalyptic number.

It is an amenable number.

4891661225 is a deficient number, since it is larger than the sum of its proper divisors (1725422695).

4891661225 is a wasteful number, since it uses less digits than its factorization.

4891661225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17787880 (or 17787875 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 4891661225 is about 69940.4119590384. The cubic root of 4891661225 is about 1697.5352083581.

The spelling of 4891661225 in words is "four billion, eight hundred ninety-one million, six hundred sixty-one thousand, two hundred twenty-five".