1666995 has 16 divisors (see below), whose sum is σ = 2909952. Its totient is φ = 808160.

The previous prime is 1666991. The next prime is 1666999. The reversal of 1666995 is 5996661.

It is an interprime number because it is at equal distance from previous prime (1666991) and next prime (1666999).

It is not a de Polignac number, because 1666995 - 2² = 1666991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666991) 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, 4887 + ... + 5216.

It is an arithmetic number, because the mean of its divisors is an integer number (181872).

2^1666995 is an apocalyptic number.

1666995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666995 is a deficient number, since it is larger than the sum of its proper divisors (1242957).

1666995 is a wasteful number, since it uses less digits than its factorization.

1666995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10122.

The product of its digits is 87480, while the sum is 42.

The square root of 1666995 is about 1291.1216054268. The cubic root of 1666995 is about 118.5708952827.

The spelling of 1666995 in words is "one million, six hundred sixty-six thousand, nine hundred ninety-five".