2506665 has 16 divisors (see below), whose sum is σ = 4583808. Its totient is φ = 1145856.

The previous prime is 2506661. The next prime is 2506681. The reversal of 2506665 is 5666052.

It is not a de Polignac number, because 2506665 - 2² = 2506661 is a prime.

It is a Curzon number.

2506665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2506661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11832 + ... + 12041.

It is an arithmetic number, because the mean of its divisors is an integer number (286488).

2^2506665 is an apocalyptic number.

It is an amenable number.

2506665 is a deficient number, since it is larger than the sum of its proper divisors (2077143).

2506665 is a wasteful number, since it uses less digits than its factorization.

2506665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23888.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 2506665 is about 1583.2450852600. The cubic root of 2506665 is about 135.8413844283.

The spelling of 2506665 in words is "two million, five hundred six thousand, six hundred sixty-five".