166561245 has 32 divisors (see below), whose sum is σ = 301708800. Its totient is φ = 87152832.

The previous prime is 166561237. The next prime is 166561259. The reversal of 166561245 is 542165661.

It is not a de Polignac number, because 166561245 - 2³ = 166561237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4485 + ... + 18794.

It is an arithmetic number, because the mean of its divisors is an integer number (9428400).

Almost surely, 2^166561245 is an apocalyptic number.

166561245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166561245 is a deficient number, since it is larger than the sum of its proper divisors (135147555).

166561245 is a wasteful number, since it uses less digits than its factorization.

166561245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23346 (or 23340 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 166561245 is about 12905.8608779112. The cubic root of 166561245 is about 550.2051521181.

The spelling of 166561245 in words is "one hundred sixty-six million, five hundred sixty-one thousand, two hundred forty-five".