166720067 has 4 divisors (see below), whose sum is σ = 167062896. Its totient is φ = 166377240.

The previous prime is 166720061. The next prime is 166720091. The reversal of 166720067 is 760027661.

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 166720067 - 2¹⁰ = 166719043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166720061) 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 3 ways as a sum of consecutive naturals, for example, 170684 + ... + 171657.

It is an arithmetic number, because the mean of its divisors is an integer number (41765724).

Almost surely, 2^166720067 is an apocalyptic number.

166720067 is a deficient number, since it is larger than the sum of its proper divisors (342829).

166720067 is an equidigital number, since it uses as much as digits as its factorization.

166720067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342828.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 166720067 is about 12912.0125077387. The cubic root of 166720067 is about 550.3799765450.

The spelling of 166720067 in words is "one hundred sixty-six million, seven hundred twenty thousand, sixty-seven".