665514285671 has 2 divisors, whose sum is σ = 665514285672. Its totient is φ = 665514285670.

The previous prime is 665514285547. The next prime is 665514285727. The reversal of 665514285671 is 176582415566.

It is an a-pointer prime, because the next prime (665514285727) can be obtained adding 665514285671 to its sum of digits (56).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665514285671 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665514255671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332757142835 + 332757142836.

It is an arithmetic number, because the mean of its divisors is an integer number (332757142836).

Almost surely, 2^665514285671 is an apocalyptic number.

665514285671 is a deficient number, since it is larger than the sum of its proper divisors (1).

665514285671 is an equidigital number, since it uses as much as digits as its factorization.

665514285671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096000, while the sum is 56.

The spelling of 665514285671 in words is "six hundred sixty-five billion, five hundred fourteen million, two hundred eighty-five thousand, six hundred seventy-one".