666123427665467 has 4 divisors (see below), whose sum is σ = 674149011131400. Its totient is φ = 658097844199536.

The previous prime is 666123427665461. The next prime is 666123427665551. The reversal of 666123427665467 is 764566724321666.

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 666123427665467 - 2¹⁸ = 666123427403323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666123427665467.

It is not an unprimeable number, because it can be changed into a prime (666123427665461) 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, 4012791732842 + ... + 4012791733007.

It is an arithmetic number, because the mean of its divisors is an integer number (168537252782850).

Almost surely, 2^{666123427665467} is an apocalyptic number.

666123427665467 is a deficient number, since it is larger than the sum of its proper divisors (8025583465933).

666123427665467 is an equidigital number, since it uses as much as digits as its factorization.

666123427665467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8025583465932.

The product of its digits is 2194698240, while the sum is 71.

The spelling of 666123427665467 in words is "six hundred sixty-six trillion, one hundred twenty-three billion, four hundred twenty-seven million, six hundred sixty-five thousand, four hundred sixty-seven".