166211925 has 96 divisors (see below), whose sum is σ = 317313024. Its totient is φ = 76032000.

The previous prime is 166211887. The next prime is 166211939. The reversal of 166211925 is 529112661.

It is not a de Polignac number, because 166211925 - 2⁹ = 166211413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1713477 + ... + 1713573.

It is an arithmetic number, because the mean of its divisors is an integer number (3305344).

Almost surely, 2^166211925 is an apocalyptic number.

166211925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166211925 is a deficient number, since it is larger than the sum of its proper divisors (151101099).

166211925 is a wasteful number, since it uses less digits than its factorization.

166211925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 214 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 166211925 is about 12892.3203885104. The cubic root of 166211925 is about 549.8202442874.

The spelling of 166211925 in words is "one hundred sixty-six million, two hundred eleven thousand, nine hundred twenty-five".