2656505 has 8 divisors (see below), whose sum is σ = 3375432. Its totient is φ = 2000128.

The previous prime is 2656501. The next prime is 2656529. The reversal of 2656505 is 5056562.

It can be written as a sum of positive squares in 4 ways, for example, as 674041 + 1982464 = 821^2 + 1408^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2656505 - 2² = 2656501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15542 + ... + 15711.

It is an arithmetic number, because the mean of its divisors is an integer number (421929).

2^2656505 is an apocalyptic number.

It is an amenable number.

2656505 is a deficient number, since it is larger than the sum of its proper divisors (718927).

2656505 is a wasteful number, since it uses less digits than its factorization.

2656505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31275.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 2656505 is about 1629.8788298521. The cubic root of 2656505 is about 138.4958880037.

It can be divided in two parts, 2 and 656505, that multiplied together give a triangular number (1313010 = T₁₆₂₀).

The spelling of 2656505 in words is "two million, six hundred fifty-six thousand, five hundred five".