2131666225 has 12 divisors (see below), whose sum is σ = 2846594716. Its totient is φ = 1574153280.

The previous prime is 2131666223. The next prime is 2131666249. The reversal of 2131666225 is 5226661312.

It can be written as a sum of positive squares in 6 ways, for example, as 18241441 + 2113424784 = 4271^2 + 45972^2 .

It is not a de Polignac number, because 2131666225 - 2¹ = 2131666223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131666223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3279162 + ... + 3279811.

Almost surely, 2^2131666225 is an apocalyptic number.

2131666225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2131666225 is a deficient number, since it is larger than the sum of its proper divisors (714928491).

2131666225 is a wasteful number, since it uses less digits than its factorization.

2131666225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6558996 (or 6558991 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 2131666225 is about 46169.9710309634. The cubic root of 2131666225 is about 1286.9837638799.

The spelling of 2131666225 in words is "two billion, one hundred thirty-one million, six hundred sixty-six thousand, two hundred twenty-five".