666641334606263 has 8 divisors (see below), whose sum is σ = 668437602495168. Its totient is φ = 664845114983904.

The previous prime is 666641334606239. The next prime is 666641334606277. The reversal of 666641334606263 is 362606433146666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666641334606263 - 2²⁶ = 666641267497399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666641334606196 and 666641334606205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666641334606463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15679745 + ... + 39738357.

It is an arithmetic number, because the mean of its divisors is an integer number (83554700311896).

Almost surely, 2^{666641334606263} is an apocalyptic number.

666641334606263 is a deficient number, since it is larger than the sum of its proper divisors (1796267888905).

666641334606263 is a wasteful number, since it uses less digits than its factorization.

666641334606263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24133273.

The product of its (nonzero) digits is 241864704, while the sum is 62.

The spelling of 666641334606263 in words is "six hundred sixty-six trillion, six hundred forty-one billion, three hundred thirty-four million, six hundred six thousand, two hundred sixty-three".