166647489 has 16 divisors (see below), whose sum is σ = 237253632. Its totient is φ = 103794768.

The previous prime is 166647487. The next prime is 166647491. The reversal of 166647489 is 984746661.

It is an interprime number because it is at equal distance from previous prime (166647487) and next prime (166647491).

It is not a de Polignac number, because 166647489 - 2¹ = 166647487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166647487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25117 + ... + 31050.

It is an arithmetic number, because the mean of its divisors is an integer number (14828352).

Almost surely, 2^166647489 is an apocalyptic number.

It is an amenable number.

166647489 is a deficient number, since it is larger than the sum of its proper divisors (70606143).

166647489 is a wasteful number, since it uses less digits than its factorization.

166647489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56236.

The product of its digits is 1741824, while the sum is 51.

The square root of 166647489 is about 12909.2017181544. The cubic root of 166647489 is about 550.3000995861.

The spelling of 166647489 in words is "one hundred sixty-six million, six hundred forty-seven thousand, four hundred eighty-nine".