2661505 has 32 divisors (see below), whose sum is σ = 4128768. Its totient is φ = 1598400.

The previous prime is 2661497. The next prime is 2661517. The reversal of 2661505 is 5051662.

It is not a de Polignac number, because 2661505 - 2³ = 2661497 is a prime.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11824 + ... + 12046.

It is an arithmetic number, because the mean of its divisors is an integer number (129024).

2^2661505 is an apocalyptic number.

It is an amenable number.

2661505 is a deficient number, since it is larger than the sum of its proper divisors (1467263).

2661505 is a wasteful number, since it uses less digits than its factorization.

2661505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2661505 is about 1631.4119651394. The cubic root of 2661505 is about 138.5827245851.

It can be divided in two parts, 266 and 1505, that added together give a palindrome (1771).

The spelling of 2661505 in words is "two million, six hundred sixty-one thousand, five hundred five".