666436161247 has 2 divisors, whose sum is σ = 666436161248. Its totient is φ = 666436161246.

The previous prime is 666436161239. The next prime is 666436161253. The reversal of 666436161247 is 742161634666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666436161247 - 2³ = 666436161239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666436161194 and 666436161203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666436161257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333218080623 + 333218080624.

It is an arithmetic number, because the mean of its divisors is an integer number (333218080624).

Almost surely, 2^666436161247 is an apocalyptic number.

666436161247 is a deficient number, since it is larger than the sum of its proper divisors (1).

666436161247 is an equidigital number, since it uses as much as digits as its factorization.

666436161247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 52.

The spelling of 666436161247 in words is "six hundred sixty-six billion, four hundred thirty-six million, one hundred sixty-one thousand, two hundred forty-seven".