1661164 has 12 divisors (see below), whose sum is σ = 2916088. Its totient is φ = 828000.

The previous prime is 1661161. The next prime is 1661173. The reversal of 1661164 is 4611661.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1661161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2059 + ... + 2749.

2^1661164 is an apocalyptic number.

It is an amenable number.

1661164 is a deficient number, since it is larger than the sum of its proper divisors (1254924).

1661164 is a wasteful number, since it uses less digits than its factorization.

1661164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296 (or 1294 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 1661164 is about 1288.8615131192. The cubic root of 1661164 is about 118.4324836304.

The spelling of 1661164 in words is "one million, six hundred sixty-one thousand, one hundred sixty-four".