866766220131401 has 2 divisors, whose sum is σ = 866766220131402. Its totient is φ = 866766220131400.

The previous prime is 866766220131373. The next prime is 866766220131433. The reversal of 866766220131401 is 104131022667668.

It is a happy number.

866766220131401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 864324426366025 + 2441793765376 = 29399395^2 + 1562624^2 .

It is a cyclic number.

It is not a de Polignac number, because 866766220131401 - 2⁶ = 866766220131337 is a prime.

It is not a weakly prime, because it can be changed into another prime (866766220121401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433383110065700 + 433383110065701.

It is an arithmetic number, because the mean of its divisors is an integer number (433383110065701).

Almost surely, 2^{866766220131401} is an apocalyptic number.

It is an amenable number.

866766220131401 is a deficient number, since it is larger than the sum of its proper divisors (1).

866766220131401 is an equidigital number, since it uses as much as digits as its factorization.

866766220131401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 866766220131401 in words is "eight hundred sixty-six trillion, seven hundred sixty-six billion, two hundred twenty million, one hundred thirty-one thousand, four hundred one".