2661543 has 6 divisors (see below), whose sum is σ = 3844464. Its totient is φ = 1774356.

The previous prime is 2661541. The next prime is 2661553. The reversal of 2661543 is 3451662.

2661543 is a `hidden beast` number, since 2 + 6 + 615 + 43 = 666.

2661543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2661543 - 2¹ = 2661541 is a prime.

It is a super-2 number, since 2×2661543² = 14167622281698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147855 + ... + 147872.

It is an arithmetic number, because the mean of its divisors is an integer number (640744).

2^2661543 is an apocalyptic number.

2661543 is a deficient number, since it is larger than the sum of its proper divisors (1182921).

2661543 is a wasteful number, since it uses less digits than its factorization.

2661543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295733 (or 295730 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2661543 is about 1631.4236114511. The cubic root of 2661543 is about 138.5833841266.

The spelling of 2661543 in words is "two million, six hundred sixty-one thousand, five hundred forty-three".