2541111661 has 16 divisors (see below), whose sum is σ = 2946378240. Its totient is φ = 2167251120.

The previous prime is 2541111637. The next prime is 2541111667. The reversal of 2541111661 is 1661111452.

It is a cyclic number.

It is not a de Polignac number, because 2541111661 - 2⁹ = 2541111149 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 (2541111667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37495 + ... + 80548.

It is an arithmetic number, because the mean of its divisors is an integer number (184148640).

Almost surely, 2^2541111661 is an apocalyptic number.

It is an amenable number.

2541111661 is a deficient number, since it is larger than the sum of its proper divisors (405266579).

2541111661 is a wasteful number, since it uses less digits than its factorization.

2541111661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118176.

The product of its digits is 1440, while the sum is 28.

The square root of 2541111661 is about 50409.4401972488. The cubic root of 2541111661 is about 1364.6080106339.

The spelling of 2541111661 in words is "two billion, five hundred forty-one million, one hundred eleven thousand, six hundred sixty-one".