166222587 has 8 divisors (see below), whose sum is σ = 231266304. Its totient is φ = 105996968.

The previous prime is 166222571. The next prime is 166222591. The reversal of 166222587 is 785222661.

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 166222587 - 2⁴ = 166222571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166222517) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1204443 + ... + 1204580.

It is an arithmetic number, because the mean of its divisors is an integer number (28908288).

Almost surely, 2^166222587 is an apocalyptic number.

166222587 is a deficient number, since it is larger than the sum of its proper divisors (65043717).

166222587 is a wasteful number, since it uses less digits than its factorization.

166222587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409049.

The product of its digits is 80640, while the sum is 39.

The square root of 166222587 is about 12892.7338838588. The cubic root of 166222587 is about 549.8320004798.

The spelling of 166222587 in words is "one hundred sixty-six million, two hundred twenty-two thousand, five hundred eighty-seven".