2661003 has 24 divisors (see below), whose sum is σ = 4042896. Its totient is φ = 1684800.

The previous prime is 2660989. The next prime is 2661013. The reversal of 2661003 is 3001662.

It is a happy number.

2661003 is a `hidden beast` number, since 2 + 661 + 0 + 0 + 3 = 666.

It is not a de Polignac number, because 2661003 - 2¹⁴ = 2644619 is a prime.

2661003 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2661013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20248 + ... + 20378.

It is an arithmetic number, because the mean of its divisors is an integer number (168454).

2^2661003 is an apocalyptic number.

2661003 is a deficient number, since it is larger than the sum of its proper divisors (1381893).

2661003 is a wasteful number, since it uses less digits than its factorization.

2661003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 2661003 is about 1631.2581034281. The cubic root of 2661003 is about 138.5740111063.

Adding to 2661003 its reverse (3001662), we get a palindrome (5662665).

The spelling of 2661003 in words is "two million, six hundred sixty-one thousand, three".