166420925 has 12 divisors (see below), whose sum is σ = 225122496. Its totient is φ = 121033200.

The previous prime is 166420913. The next prime is 166420951. The reversal of 166420925 is 529024661.

It is a happy number.

It is not a de Polignac number, because 166420925 - 2⁴ = 166420909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 302309 + ... + 302858.

It is an arithmetic number, because the mean of its divisors is an integer number (18760208).

Almost surely, 2^166420925 is an apocalyptic number.

It is an amenable number.

166420925 is a deficient number, since it is larger than the sum of its proper divisors (58701571).

166420925 is a wasteful number, since it uses less digits than its factorization.

166420925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605188 (or 605183 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 166420925 is about 12900.4234426626. The cubic root of 166420925 is about 550.0506014050.

The spelling of 166420925 in words is "one hundred sixty-six million, four hundred twenty thousand, nine hundred twenty-five".