666356216435027 has 4 divisors (see below), whose sum is σ = 666356474750640. Its totient is φ = 666355958119416.

The previous prime is 666356216435017. The next prime is 666356216435123. The reversal of 666356216435027 is 720534612653666.

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 666356216435027 - 2¹⁴ = 666356216418643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666356216435017) 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, 125248943 + ... + 130460760.

It is an arithmetic number, because the mean of its divisors is an integer number (166589118687660).

Almost surely, 2^{666356216435027} is an apocalyptic number.

666356216435027 is a deficient number, since it is larger than the sum of its proper divisors (258315613).

666356216435027 is a wasteful number, since it uses less digits than its factorization.

666356216435027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258315612.

The product of its (nonzero) digits is 195955200, while the sum is 62.

The spelling of 666356216435027 in words is "six hundred sixty-six trillion, three hundred fifty-six billion, two hundred sixteen million, four hundred thirty-five thousand, twenty-seven".