166507945 has 8 divisors (see below), whose sum is σ = 211563144. Its totient is φ = 125370624.

The previous prime is 166507921. The next prime is 166508021. The reversal of 166507945 is 549705661.

It can be written as a sum of positive squares in 4 ways, for example, as 21353641 + 145154304 = 4621^2 + 12048^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166507945 - 2⁹ = 166507433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 979374 + ... + 979543.

It is an arithmetic number, because the mean of its divisors is an integer number (26445393).

Almost surely, 2^166507945 is an apocalyptic number.

It is an amenable number.

166507945 is a deficient number, since it is larger than the sum of its proper divisors (45055199).

166507945 is a wasteful number, since it uses less digits than its factorization.

166507945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958939.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 166507945 is about 12903.7957593880. The cubic root of 166507945 is about 550.1464568650.

The spelling of 166507945 in words is "one hundred sixty-six million, five hundred seven thousand, nine hundred forty-five".