166555479 has 4 divisors (see below), whose sum is σ = 222073976. Its totient is φ = 111036984.

The previous prime is 166555471. The next prime is 166555481. The reversal of 166555479 is 974555661.

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

It is not a de Polignac number, because 166555479 - 2³ = 166555471 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 (166555471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27759244 + ... + 27759249.

It is an arithmetic number, because the mean of its divisors is an integer number (55518494).

Almost surely, 2^166555479 is an apocalyptic number.

166555479 is a deficient number, since it is larger than the sum of its proper divisors (55518497).

166555479 is an equidigital number, since it uses as much as digits as its factorization.

166555479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55518496.

The product of its digits is 1134000, while the sum is 48.

The square root of 166555479 is about 12905.6374890975. The cubic root of 166555479 is about 550.1988030631.

The spelling of 166555479 in words is "one hundred sixty-six million, five hundred fifty-five thousand, four hundred seventy-nine".