191666254225 has 6 divisors (see below), whose sum is σ = 237666155270. Its totient is φ = 153333003360.

The previous prime is 191666254189. The next prime is 191666254253. The reversal of 191666254225 is 522452666191.

It can be written as a sum of positive squares in 3 ways, for example, as 136609344 + 191529644881 = 11688^2 + 437641^2 .

It is not a de Polignac number, because 191666254225 - 2³¹ = 189518770577 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3833325060 + ... + 3833325109.

Almost surely, 2^191666254225 is an apocalyptic number.

It is an amenable number.

191666254225 is a deficient number, since it is larger than the sum of its proper divisors (45999901045).

191666254225 is an equidigital number, since it uses as much as digits as its factorization.

191666254225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7666650179 (or 7666650174 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 49.

The spelling of 191666254225 in words is "one hundred ninety-one billion, six hundred sixty-six million, two hundred fifty-four thousand, two hundred twenty-five".