87766666663441 has 2 divisors, whose sum is σ = 87766666663442. Its totient is φ = 87766666663440.

The previous prime is 87766666663373. The next prime is 87766666663457. The reversal of 87766666663441 is 14436666666778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73913911182400 + 13852755481041 = 8597320^2 + 3721929^2 .

It is a cyclic number.

It is not a de Polignac number, because 87766666663441 - 2³³ = 87758076728849 is a prime.

It is not a weakly prime, because it can be changed into another prime (87766666663141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43883333331720 + 43883333331721.

It is an arithmetic number, because the mean of its divisors is an integer number (43883333331721).

Almost surely, 2^{87766666663441} is an apocalyptic number.

It is an amenable number.

87766666663441 is a deficient number, since it is larger than the sum of its proper divisors (1).

87766666663441 is an equidigital number, since it uses as much as digits as its factorization.

87766666663441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5267275776, while the sum is 76.

The spelling of 87766666663441 in words is "eighty-seven trillion, seven hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-three thousand, four hundred forty-one".