166210425 has 18 divisors (see below), whose sum is σ = 297701742. Its totient is φ = 88645440.

The previous prime is 166210393. The next prime is 166210427. The reversal of 166210425 is 524012661.

166210425 is a `hidden beast` number, since 16 + 621 + 0 + 4 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 14107536 + 152102889 = 3756^2 + 12333^2 .

It is not a de Polignac number, because 166210425 - 2⁵ = 166210393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166210427) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 369132 + ... + 369581.

Almost surely, 2^166210425 is an apocalyptic number.

166210425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166210425 is a deficient number, since it is larger than the sum of its proper divisors (131491317).

166210425 is a wasteful number, since it uses less digits than its factorization.

166210425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738729 (or 738721 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 166210425 is about 12892.2622142121. The cubic root of 166210425 is about 549.8185903089.

The spelling of 166210425 in words is "one hundred sixty-six million, two hundred ten thousand, four hundred twenty-five".