665514255671 has 2 divisors, whose sum is σ = 665514255672. Its totient is φ = 665514255670.

The previous prime is 665514255649. The next prime is 665514255689. The reversal of 665514255671 is 176552415566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665514255671 - 2¹⁴ = 665514239287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665514255871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332757127835 + 332757127836.

It is an arithmetic number, because the mean of its divisors is an integer number (332757127836).

Almost surely, 2^665514255671 is an apocalyptic number.

665514255671 is a deficient number, since it is larger than the sum of its proper divisors (1).

665514255671 is an equidigital number, since it uses as much as digits as its factorization.

665514255671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560000, while the sum is 53.

The spelling of 665514255671 in words is "six hundred sixty-five billion, five hundred fourteen million, two hundred fifty-five thousand, six hundred seventy-one".