166787 has 4 divisors (see below), whose sum is σ = 176616. Its totient is φ = 156960.

The previous prime is 166783. The next prime is 166799. The reversal of 166787 is 787661.

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 166787 - 2² = 166783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166781) 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, 4889 + ... + 4922.

It is an arithmetic number, because the mean of its divisors is an integer number (44154).

2¹⁶⁶⁷⁸⁷ is an apocalyptic number.

166787 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

166787 is a deficient number, since it is larger than the sum of its proper divisors (9829).

166787 is an equidigital number, since it uses as much as digits as its factorization.

166787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9828.

The product of its digits is 14112, while the sum is 35.

The square root of 166787 is about 408.3956415047. The cubic root of 166787 is about 55.0453620258.

The spelling of 166787 in words is "one hundred sixty-six thousand, seven hundred eighty-seven".