665965127 has 2 divisors, whose sum is σ = 665965128. Its totient is φ = 665965126.

The previous prime is 665965063. The next prime is 665965129. The reversal of 665965127 is 721569566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665965127 - 2⁶ = 665965063 is a prime.

It is a super-2 number, since 2×665965127² = 887019100760252258, which contains 22 as substring.

Together with 665965129, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665965129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332982563 + 332982564.

It is an arithmetic number, because the mean of its divisors is an integer number (332982564).

Almost surely, 2^665965127 is an apocalyptic number.

665965127 is a deficient number, since it is larger than the sum of its proper divisors (1).

665965127 is an equidigital number, since it uses as much as digits as its factorization.

665965127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 47.

The square root of 665965127 is about 25806.3001416321. The cubic root of 665965127 is about 873.2739315145.

The spelling of 665965127 in words is "six hundred sixty-five million, nine hundred sixty-five thousand, one hundred twenty-seven".