166207447 has 4 divisors (see below), whose sum is σ = 189951376. Its totient is φ = 142463520.

The previous prime is 166207423. The next prime is 166207469. The reversal of 166207447 is 744702661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744702661 = 59 ⋅12622079.

It is a cyclic number.

It is not a de Polignac number, because 166207447 - 2¹⁹ = 165683159 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 (166207247) 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, 11871954 + ... + 11871967.

It is an arithmetic number, because the mean of its divisors is an integer number (47487844).

Almost surely, 2^166207447 is an apocalyptic number.

166207447 is a deficient number, since it is larger than the sum of its proper divisors (23743929).

166207447 is an equidigital number, since it uses as much as digits as its factorization.

166207447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23743928.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 166207447 is about 12892.1467180606. The cubic root of 166207447 is about 549.8153065808.

The spelling of 166207447 in words is "one hundred sixty-six million, two hundred seven thousand, four hundred forty-seven".