166663447 has 4 divisors (see below), whose sum is σ = 168536160. Its totient is φ = 164790736.

The previous prime is 166663439. The next prime is 166663489. The reversal of 166663447 is 744366661.

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 166663447 - 2³ = 166663439 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 (166663547) 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, 936223 + ... + 936400.

It is an arithmetic number, because the mean of its divisors is an integer number (42134040).

Almost surely, 2^166663447 is an apocalyptic number.

166663447 is a deficient number, since it is larger than the sum of its proper divisors (1872713).

166663447 is an equidigital number, since it uses as much as digits as its factorization.

166663447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872712.

The product of its digits is 435456, while the sum is 43.

The square root of 166663447 is about 12909.8197896020. The cubic root of 166663447 is about 550.3176644246.

It can be divided in two parts, 1666634 and 47, that added together give a square (1666681 = 1291²).

The spelling of 166663447 in words is "one hundred sixty-six million, six hundred sixty-three thousand, four hundred forty-seven".