2661260543 has 4 divisors (see below), whose sum is σ = 2687098128. Its totient is φ = 2635422960.

The previous prime is 2661260531. The next prime is 2661260551. The reversal of 2661260543 is 3450621662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2661260543 - 2¹⁶ = 2661195007 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 (2661260573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12918638 + ... + 12918843.

It is an arithmetic number, because the mean of its divisors is an integer number (671774532).

Almost surely, 2^2661260543 is an apocalyptic number.

2661260543 is a deficient number, since it is larger than the sum of its proper divisors (25837585).

2661260543 is a wasteful number, since it uses less digits than its factorization.

2661260543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25837584.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 2661260543 is about 51587.4068256973. The cubic root of 2661260543 is about 1385.7848155291.

The spelling of 2661260543 in words is "two billion, six hundred sixty-one million, two hundred sixty thousand, five hundred forty-three".