1500566661361 has 2 divisors, whose sum is σ = 1500566661362. Its totient is φ = 1500566661360.

The previous prime is 1500566661359. The next prime is 1500566661403. The reversal of 1500566661361 is 1631666650051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151208827136 + 349357834225 = 1072944^2 + 591065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1500566661361 - 2¹ = 1500566661359 is a prime.

Together with 1500566661359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1500566661331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750283330680 + 750283330681.

It is an arithmetic number, because the mean of its divisors is an integer number (750283330681).

Almost surely, 2^{1500566661361} is an apocalyptic number.

It is an amenable number.

1500566661361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1500566661361 is an equidigital number, since it uses as much as digits as its factorization.

1500566661361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 1500566661361 in words is "one trillion, five hundred billion, five hundred sixty-six million, six hundred sixty-one thousand, three hundred sixty-one".