665223777012127 has 2 divisors, whose sum is σ = 665223777012128. Its totient is φ = 665223777012126.

The previous prime is 665223777012121. The next prime is 665223777012169. The reversal of 665223777012127 is 721210777322566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665223777012127 - 2⁴³ = 656427683989919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665223777012121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332611888506063 + 332611888506064.

It is an arithmetic number, because the mean of its divisors is an integer number (332611888506064).

Almost surely, 2^{665223777012127} is an apocalyptic number.

665223777012127 is a deficient number, since it is larger than the sum of its proper divisors (1).

665223777012127 is an equidigital number, since it uses as much as digits as its factorization.

665223777012127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20744640, while the sum is 58.

The spelling of 665223777012127 in words is "six hundred sixty-five trillion, two hundred twenty-three billion, seven hundred seventy-seven million, twelve thousand, one hundred twenty-seven".