1660665223 has 6 divisors (see below), whose sum is σ = 1931794296. Its totient is φ = 1423427292.

The previous prime is 1660665187. The next prime is 1660665239. The reversal of 1660665223 is 3225660661.

It is not a de Polignac number, because 1660665223 - 2⁹ = 1660664711 is a prime.

It is a super-3 number, since 3×1660665223³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660665263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16945515 + ... + 16945612.

It is an arithmetic number, because the mean of its divisors is an integer number (321965716).

Almost surely, 2^1660665223 is an apocalyptic number.

1660665223 is a deficient number, since it is larger than the sum of its proper divisors (271129073).

1660665223 is an equidigital number, since it uses as much as digits as its factorization.

1660665223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33891141 (or 33891134 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 1660665223 is about 40751.2603854163. The cubic root of 1660665223 is about 1184.2062902879.

The spelling of 1660665223 in words is "one billion, six hundred sixty million, six hundred sixty-five thousand, two hundred twenty-three".