1666275 has 24 divisors (see below), whose sum is σ = 2968560. Its totient is φ = 819840.

The previous prime is 1666271. The next prime is 1666279. The reversal of 1666275 is 5726661.

It is an interprime number because it is at equal distance from previous prime (1666271) and next prime (1666279).

It is not a de Polignac number, because 1666275 - 2² = 1666271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121 + ... + 1829.

It is an arithmetic number, because the mean of its divisors is an integer number (123690).

2^1666275 is an apocalyptic number.

1666275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666275 is a deficient number, since it is larger than the sum of its proper divisors (1302285).

1666275 is a wasteful number, since it uses less digits than its factorization.

1666275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735 (or 1730 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 1666275 is about 1290.8427479751. The cubic root of 1666275 is about 118.5538219784.

It can be divided in two parts, 166 and 6275, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 1666275 in words is "one million, six hundred sixty-six thousand, two hundred seventy-five".