666312271815467 has 2 divisors, whose sum is σ = 666312271815468. Its totient is φ = 666312271815466.

The previous prime is 666312271815461. The next prime is 666312271815473. The reversal of 666312271815467 is 764518172213666.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (666312271815461) and next prime (666312271815473).

It is a cyclic number.

It is not a de Polignac number, because 666312271815467 - 2⁴ = 666312271815451 is a prime.

It is a super-2 number, since 2×666312271815467² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666312271815461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333156135907733 + 333156135907734.

It is an arithmetic number, because the mean of its divisors is an integer number (333156135907734).

Almost surely, 2^{666312271815467} is an apocalyptic number.

666312271815467 is a deficient number, since it is larger than the sum of its proper divisors (1).

666312271815467 is an equidigital number, since it uses as much as digits as its factorization.

666312271815467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121927680, while the sum is 65.

The spelling of 666312271815467 in words is "six hundred sixty-six trillion, three hundred twelve billion, two hundred seventy-one million, eight hundred fifteen thousand, four hundred sixty-seven".