2661506646041 has 8 divisors (see below), whose sum is σ = 2823125234760. Its totient is φ = 2500450210048.

The previous prime is 2661506646031. The next prime is 2661506646077. The reversal of 2661506646041 is 1406466051662.

It can be written as a sum of positive squares in 4 ways, for example, as 2894870416 + 2658611775625 = 53804^2 + 1630525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2661506646041 - 2²² = 2661502451737 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2661506646031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140528426 + ... + 140547363.

It is an arithmetic number, because the mean of its divisors is an integer number (352890654345).

Almost surely, 2^{2661506646041} is an apocalyptic number.

It is an amenable number.

2661506646041 is a deficient number, since it is larger than the sum of its proper divisors (161618588719).

2661506646041 is a wasteful number, since it uses less digits than its factorization.

2661506646041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281076363.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 2661506646041 in words is "two trillion, six hundred sixty-one billion, five hundred six million, six hundred forty-six thousand, forty-one".