866690090401 has 2 divisors, whose sum is σ = 866690090402. Its totient is φ = 866690090400.

The previous prime is 866690090377. The next prime is 866690090411. The reversal of 866690090401 is 104090096668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 851515546176 + 15174544225 = 922776^2 + 123185^2 .

It is a cyclic number.

It is not a de Polignac number, because 866690090401 - 2²³ = 866681701793 is a prime.

It is not a weakly prime, because it can be changed into another prime (866690090411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433345045200 + 433345045201.

It is an arithmetic number, because the mean of its divisors is an integer number (433345045201).

Almost surely, 2^866690090401 is an apocalyptic number.

It is an amenable number.

866690090401 is a deficient number, since it is larger than the sum of its proper divisors (1).

866690090401 is an equidigital number, since it uses as much as digits as its factorization.

866690090401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 866690090401 in words is "eight hundred sixty-six billion, six hundred ninety million, ninety thousand, four hundred one".