166228487 has 4 divisors (see below), whose sum is σ = 166296696. Its totient is φ = 166160280.

The previous prime is 166228483. The next prime is 166228523. The reversal of 166228487 is 784822661.

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

It is a cyclic number.

It is not a de Polignac number, because 166228487 - 2² = 166228483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166228483) 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, 30308 + ... + 35369.

It is an arithmetic number, because the mean of its divisors is an integer number (41574174).

Almost surely, 2^166228487 is an apocalyptic number.

166228487 is a deficient number, since it is larger than the sum of its proper divisors (68209).

166228487 is an equidigital number, since it uses as much as digits as its factorization.

166228487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68208.

The product of its digits is 258048, while the sum is 44.

The square root of 166228487 is about 12892.9626928802. The cubic root of 166228487 is about 549.8385057538.

The spelling of 166228487 in words is "one hundred sixty-six million, two hundred twenty-eight thousand, four hundred eighty-seven".