666255426004213 has 4 divisors (see below), whose sum is σ = 667291593074848. Its totient is φ = 665219258933580.

The previous prime is 666255426004187. The next prime is 666255426004237. The reversal of 666255426004213 is 312400624552666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666255426004213 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 (666255426004813) 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, 518083534353 + ... + 518083535638.

It is an arithmetic number, because the mean of its divisors is an integer number (166822898268712).

Almost surely, 2^{666255426004213} is an apocalyptic number.

It is an amenable number.

666255426004213 is a deficient number, since it is larger than the sum of its proper divisors (1036167070635).

666255426004213 is a wasteful number, since it uses less digits than its factorization.

666255426004213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036167070634.

The product of its (nonzero) digits is 12441600, while the sum is 52.

The spelling of 666255426004213 in words is "six hundred sixty-six trillion, two hundred fifty-five billion, four hundred twenty-six million, four thousand, two hundred thirteen".