666436161263 has 4 divisors (see below), whose sum is σ = 677731689480. Its totient is φ = 655140633048.

The previous prime is 666436161257. The next prime is 666436161299. The reversal of 666436161263 is 362161634666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666436161263 - 2⁴ = 666436161247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666436161253) 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 in 3 ways as a sum of consecutive naturals, for example, 5647764020 + ... + 5647764137.

It is an arithmetic number, because the mean of its divisors is an integer number (169432922370).

Almost surely, 2^666436161263 is an apocalyptic number.

666436161263 is a deficient number, since it is larger than the sum of its proper divisors (11295528217).

666436161263 is a wasteful number, since it uses less digits than its factorization.

666436161263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11295528216.

The product of its digits is 3359232, while the sum is 50.

The spelling of 666436161263 in words is "six hundred sixty-six billion, four hundred thirty-six million, one hundred sixty-one thousand, two hundred sixty-three".