2721655841 has 4 divisors (see below), whose sum is σ = 2773007892. Its totient is φ = 2670303792.

The previous prime is 2721655831. The next prime is 2721655877. The reversal of 2721655841 is 1485561272.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2512014400 + 209641441 = 50120^2 + 14479^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721655841 - 2⁶ = 2721655777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2721655831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25675946 + ... + 25676051.

It is an arithmetic number, because the mean of its divisors is an integer number (693251973).

Almost surely, 2^2721655841 is an apocalyptic number.

It is an amenable number.

2721655841 is a deficient number, since it is larger than the sum of its proper divisors (51352051).

2721655841 is an equidigital number, since it uses as much as digits as its factorization.

2721655841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51352050.

The product of its digits is 134400, while the sum is 41.

The square root of 2721655841 is about 52169.4914772993. The cubic root of 2721655841 is about 1396.1896116110.

The spelling of 2721655841 in words is "two billion, seven hundred twenty-one million, six hundred fifty-five thousand, eight hundred forty-one".