2541562281661 has 6 divisors (see below), whose sum is σ = 2752105902810. Its totient is φ = 2346057490608.

The previous prime is 2541562281623. The next prime is 2541562281673. The reversal of 2541562281661 is 1661822651452.

It can be written as a sum of positive squares in 3 ways, for example, as 46997904100 + 2494564377561 = 216790^2 + 1579419^2 .

It is not a de Polignac number, because 2541562281661 - 2¹⁹ = 2541561757373 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 (2541562281611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7519414866 + ... + 7519415203.

It is an arithmetic number, because the mean of its divisors is an integer number (458684317135).

Almost surely, 2^{2541562281661} is an apocalyptic number.

It is an amenable number.

2541562281661 is a deficient number, since it is larger than the sum of its proper divisors (210543621149).

2541562281661 is a wasteful number, since it uses less digits than its factorization.

2541562281661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15038830095 (or 15038830082 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 49.

The spelling of 2541562281661 in words is "two trillion, five hundred forty-one billion, five hundred sixty-two million, two hundred eighty-one thousand, six hundred sixty-one".