1661168 has 20 divisors (see below), whose sum is σ = 3288480. Its totient is φ = 812912.

The previous prime is 1661161. The next prime is 1661173. The reversal of 1661168 is 8611661.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a self number, because there is not a number n which added to its sum of digits gives 1661168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661161) 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, 35321 + ... + 35367.

It is an arithmetic number, because the mean of its divisors is an integer number (164424).

2^1661168 is an apocalyptic number.

It is an amenable number.

1661168 is a deficient number, since it is larger than the sum of its proper divisors (1627312).

1661168 is an frugal number, since it uses more digits than its factorization.

1661168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 49 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 1661168 is about 1288.8630648754. The cubic root of 1661168 is about 118.4325786901.

The spelling of 1661168 in words is "one million, six hundred sixty-one thousand, one hundred sixty-eight".