2558665 has 8 divisors (see below), whose sum is σ = 3080520. Its totient is φ = 2040192.

The previous prime is 2558639. The next prime is 2558671. The reversal of 2558665 is 5668552.

It can be written as a sum of positive squares in 4 ways, for example, as 760384 + 1798281 = 872^2 + 1341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2558665 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341 + ... + 2629.

It is an arithmetic number, because the mean of its divisors is an integer number (385065).

2^2558665 is an apocalyptic number.

It is an amenable number.

2558665 is a deficient number, since it is larger than the sum of its proper divisors (521855).

2558665 is a wasteful number, since it uses less digits than its factorization.

2558665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

The product of its digits is 72000, while the sum is 37.

The square root of 2558665 is about 1599.5827580966. The cubic root of 2558665 is about 136.7742922464.

It can be divided in two parts, 25586 and 65, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 2558665 in words is "two million, five hundred fifty-eight thousand, six hundred sixty-five".