2641240661 has 4 divisors (see below), whose sum is σ = 2654648172. Its totient is φ = 2627833152.

The previous prime is 2641240633. The next prime is 2641240681. The reversal of 2641240661 is 1660421462.

2641240661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2030854225 + 610386436 = 45065^2 + 24706^2 .

It is a cyclic number.

It is not a de Polignac number, because 2641240661 - 2¹⁰ = 2641239637 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 (2641240681) 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, 6703460 + ... + 6703853.

It is an arithmetic number, because the mean of its divisors is an integer number (663662043).

Almost surely, 2^2641240661 is an apocalyptic number.

It is an amenable number.

2641240661 is a deficient number, since it is larger than the sum of its proper divisors (13407511).

2641240661 is a wasteful number, since it uses less digits than its factorization.

2641240661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13407510.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 2641240661 is about 51393.0020625377. The cubic root of 2641240661 is about 1382.3011144344.

The spelling of 2641240661 in words is "two billion, six hundred forty-one million, two hundred forty thousand, six hundred sixty-one".