2661661131559 has 2 divisors, whose sum is σ = 2661661131560. Its totient is φ = 2661661131558.

The previous prime is 2661661131553. The next prime is 2661661131581. The reversal of 2661661131559 is 9551311661662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2661661131559 - 2⁹ = 2661661131047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661661131553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330830565779 + 1330830565780.

It is an arithmetic number, because the mean of its divisors is an integer number (1330830565780).

Almost surely, 2^{2661661131559} is an apocalyptic number.

2661661131559 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661661131559 is an equidigital number, since it uses as much as digits as its factorization.

2661661131559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 52.

The spelling of 2661661131559 in words is "two trillion, six hundred sixty-one billion, six hundred sixty-one million, one hundred thirty-one thousand, five hundred fifty-nine".