87766666604321 has 2 divisors, whose sum is σ = 87766666604322. Its totient is φ = 87766666604320.

The previous prime is 87766666604317. The next prime is 87766666604377. The reversal of 87766666604321 is 12340666666778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52221651867025 + 35545014737296 = 7226455^2 + 5961964^2 .

It is a cyclic number.

It is not a de Polignac number, because 87766666604321 - 2² = 87766666604317 is a prime.

It is not a weakly prime, because it can be changed into another prime (87766666604621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43883333302160 + 43883333302161.

It is an arithmetic number, because the mean of its divisors is an integer number (43883333302161).

Almost surely, 2^{87766666604321} is an apocalyptic number.

It is an amenable number.

87766666604321 is a deficient number, since it is larger than the sum of its proper divisors (1).

87766666604321 is an equidigital number, since it uses as much as digits as its factorization.

87766666604321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 438939648, while the sum is 68.

The spelling of 87766666604321 in words is "eighty-seven trillion, seven hundred sixty-six billion, six hundred sixty-six million, six hundred four thousand, three hundred twenty-one".