866766220131433 has 2 divisors, whose sum is σ = 866766220131434. Its totient is φ = 866766220131432.

The previous prime is 866766220131401. The next prime is 866766220131443. The reversal of 866766220131433 is 334131022667668.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613665261863824 + 253100958267609 = 24772268^2 + 15909147^2 .

It is a cyclic number.

It is not a de Polignac number, because 866766220131433 - 2⁵ = 866766220131401 is a prime.

It is not a weakly prime, because it can be changed into another prime (866766220131443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433383110065716 + 433383110065717.

It is an arithmetic number, because the mean of its divisors is an integer number (433383110065717).

Almost surely, 2^{866766220131433} is an apocalyptic number.

It is an amenable number.

866766220131433 is a deficient number, since it is larger than the sum of its proper divisors (1).

866766220131433 is an equidigital number, since it uses as much as digits as its factorization.

866766220131433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31352832, while the sum is 58.

The spelling of 866766220131433 in words is "eight hundred sixty-six trillion, seven hundred sixty-six billion, two hundred twenty million, one hundred thirty-one thousand, four hundred thirty-three".