87766666664321 has 2 divisors, whose sum is σ = 87766666664322. Its totient is φ = 87766666664320.

The previous prime is 87766666664279. The next prime is 87766666664359. The reversal of 87766666664321 is 12346666666778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56417148988225 + 31349517676096 = 7511135^2 + 5599064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87766666664321 is a prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (87766666604321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43883333332160 + 43883333332161.

It is an arithmetic number, because the mean of its divisors is an integer number (43883333332161).

Almost surely, 2^{87766666664321} is an apocalyptic number.

It is an amenable number.

87766666664321 is a deficient number, since it is larger than the sum of its proper divisors (1).

87766666664321 is an equidigital number, since it uses as much as digits as its factorization.

87766666664321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2633637888, while the sum is 74.

The spelling of 87766666664321 in words is "eighty-seven trillion, seven hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-four thousand, three hundred twenty-one".