666243123155533 has 8 divisors (see below), whose sum is σ = 830640776921280. Its totient is φ = 519150485575680.

The previous prime is 666243123155497. The next prime is 666243123155537. The reversal of 666243123155533 is 335551321342666.

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

It is not a de Polignac number, because 666243123155533 - 2⁴⁹ = 103293169734221 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 (666243123155537) 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, 4326254046388 + ... + 4326254046541.

It is an arithmetic number, because the mean of its divisors is an integer number (103830097115160).

Almost surely, 2^{666243123155533} is an apocalyptic number.

It is an amenable number.

666243123155533 is a deficient number, since it is larger than the sum of its proper divisors (164397653765747).

666243123155533 is a wasteful number, since it uses less digits than its factorization.

666243123155533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8652508092947.

The product of its digits is 34992000, while the sum is 55.

The spelling of 666243123155533 in words is "six hundred sixty-six trillion, two hundred forty-three billion, one hundred twenty-three million, one hundred fifty-five thousand, five hundred thirty-three".