2686665666541 has 2 divisors, whose sum is σ = 2686665666542. Its totient is φ = 2686665666540.

The previous prime is 2686665666521. The next prime is 2686665666577. The reversal of 2686665666541 is 1456665666862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2627572918441 + 59092748100 = 1620979^2 + 243090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2686665666541 - 2⁹ = 2686665666029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2686665666521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343332833270 + 1343332833271.

It is an arithmetic number, because the mean of its divisors is an integer number (1343332833271).

Almost surely, 2^{2686665666541} is an apocalyptic number.

It is an amenable number.

2686665666541 is a deficient number, since it is larger than the sum of its proper divisors (1).

2686665666541 is an equidigital number, since it uses as much as digits as its factorization.

2686665666541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 447897600, while the sum is 67.

The spelling of 2686665666541 in words is "two trillion, six hundred eighty-six billion, six hundred sixty-five million, six hundred sixty-six thousand, five hundred forty-one".