166375945 has 4 divisors (see below), whose sum is σ = 199651140. Its totient is φ = 133100752.

The previous prime is 166375943. The next prime is 166375961. The reversal of 166375945 is 549573661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130051216 + 36324729 = 11404^2 + 6027^2 .

It is a cyclic number.

It is not a de Polignac number, because 166375945 - 2¹ = 166375943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166375895 and 166375904.

It is not an unprimeable number, because it can be changed into a prime (166375943) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16637590 + ... + 16637599.

It is an arithmetic number, because the mean of its divisors is an integer number (49912785).

Almost surely, 2^166375945 is an apocalyptic number.

It is an amenable number.

166375945 is a deficient number, since it is larger than the sum of its proper divisors (33275195).

166375945 is an equidigital number, since it uses as much as digits as its factorization.

166375945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33275194.

The product of its digits is 680400, while the sum is 46.

The square root of 166375945 is about 12898.6799712219. The cubic root of 166375945 is about 550.0010413203.

The spelling of 166375945 in words is "one hundred sixty-six million, three hundred seventy-five thousand, nine hundred forty-five".