191668025 has 12 divisors (see below), whose sum is σ = 237914832. Its totient is φ = 153175440.

The previous prime is 191667977. The next prime is 191668031. The reversal of 191668025 is 520866191.

It is not a de Polignac number, because 191668025 - 2⁶ = 191667961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191668025.

It is an unprimeable number.

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, 24662 + ... + 31488.

It is an arithmetic number, because the mean of its divisors is an integer number (19826236).

Almost surely, 2^191668025 is an apocalyptic number.

It is an amenable number.

191668025 is a deficient number, since it is larger than the sum of its proper divisors (46246807).

191668025 is a wasteful number, since it uses less digits than its factorization.

191668025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7960 (or 7955 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 191668025 is about 13844.4221620117. The cubic root of 191668025 is about 576.5671426956.

The spelling of 191668025 in words is "one hundred ninety-one million, six hundred sixty-eight thousand, twenty-five".