2661653 has 12 divisors (see below), whose sum is σ = 2875788. Its totient is φ = 2462400.

The previous prime is 2661647. The next prime is 2661661. The reversal of 2661653 is 3561662.

It can be written as a sum of positive squares in 2 ways, for example, as 2140369 + 521284 = 1463^2 + 722^2 .

It is not a de Polignac number, because 2661653 - 2⁸ = 2661397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26303 + ... + 26403.

It is an arithmetic number, because the mean of its divisors is an integer number (239649).

2^2661653 is an apocalyptic number.

It is an amenable number.

2661653 is a deficient number, since it is larger than the sum of its proper divisors (214135).

2661653 is a wasteful number, since it uses less digits than its factorization.

2661653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 193 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 2661653 is about 1631.4573239898. The cubic root of 2661653 is about 138.5852932901.

Subtracting 2661653 from its reverse (3561662), we obtain a palindrome (900009).

The spelling of 2661653 in words is "two million, six hundred sixty-one thousand, six hundred fifty-three".