166425425 has 6 divisors (see below), whose sum is σ = 206367558. Its totient is φ = 133140320.

The previous prime is 166425421. The next prime is 166425431. The reversal of 166425425 is 524524661.

It can be written as a sum of positive squares in 3 ways, for example, as 55249489 + 111175936 = 7433^2 + 10544^2 .

It is not a de Polignac number, because 166425425 - 2² = 166425421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166425421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3328484 + ... + 3328533.

It is an arithmetic number, because the mean of its divisors is an integer number (34394593).

Almost surely, 2^166425425 is an apocalyptic number.

It is an amenable number.

166425425 is a deficient number, since it is larger than the sum of its proper divisors (39942133).

166425425 is an equidigital number, since it uses as much as digits as its factorization.

166425425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6657027 (or 6657022 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The square root of 166425425 is about 12900.5978543632. The cubic root of 166425425 is about 550.0555591257.

The spelling of 166425425 in words is "one hundred sixty-six million, four hundred twenty-five thousand, four hundred twenty-five".