2011665 has 16 divisors (see below), whose sum is σ = 3298176. Its totient is φ = 1046400.

The previous prime is 2011657. The next prime is 2011673. The reversal of 2011665 is 5661102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2011657) and next prime (2011673).

It is not a de Polignac number, because 2011665 - 2³ = 2011657 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021 + ... + 2250.

It is an arithmetic number, because the mean of its divisors is an integer number (206136).

2^2011665 is an apocalyptic number.

It is an amenable number.

2011665 is a deficient number, since it is larger than the sum of its proper divisors (1286511).

2011665 is a wasteful number, since it uses less digits than its factorization.

2011665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2011665 is about 1418.3317665483. The cubic root of 2011665 is about 126.2365799544.

Adding to 2011665 its reverse (5661102), we get a palindrome (7672767).

The spelling of 2011665 in words is "two million, eleven thousand, six hundred sixty-five".