666812455359 has 4 divisors (see below), whose sum is σ = 889083273816. Its totient is φ = 444541636904.

The previous prime is 666812455349. The next prime is 666812455427. The reversal of 666812455359 is 953554218666.

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 666812455359 - 2⁵ = 666812455327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666812455319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111135409224 + ... + 111135409229.

It is an arithmetic number, because the mean of its divisors is an integer number (222270818454).

Almost surely, 2^666812455359 is an apocalyptic number.

666812455359 is a deficient number, since it is larger than the sum of its proper divisors (222270818457).

666812455359 is a wasteful number, since it uses less digits than its factorization.

666812455359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222270818456.

The product of its digits is 46656000, while the sum is 60.

The spelling of 666812455359 in words is "six hundred sixty-six billion, eight hundred twelve million, four hundred fifty-five thousand, three hundred fifty-nine".