166617245 has 4 divisors (see below), whose sum is σ = 199940700. Its totient is φ = 133293792.

The previous prime is 166617233. The next prime is 166617247. The reversal of 166617245 is 542716661.

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 33860761 + 132756484 = 5819^2 + 11522^2 .

It is a cyclic number.

It is not a de Polignac number, because 166617245 - 2¹⁶ = 166551709 is a prime.

It is a super-2 number, since 2×166617245² = 55522612662780050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166617199 and 166617208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166617247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16661720 + ... + 16661729.

It is an arithmetic number, because the mean of its divisors is an integer number (49985175).

Almost surely, 2^166617245 is an apocalyptic number.

It is an amenable number.

166617245 is a deficient number, since it is larger than the sum of its proper divisors (33323455).

166617245 is an equidigital number, since it uses as much as digits as its factorization.

166617245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33323454.

The product of its digits is 60480, while the sum is 38.

The square root of 166617245 is about 12908.0302525211. The cubic root of 166617245 is about 550.2668071890.

The spelling of 166617245 in words is "one hundred sixty-six million, six hundred seventeen thousand, two hundred forty-five".