665061247 has 2 divisors, whose sum is σ = 665061248. Its totient is φ = 665061246.

The previous prime is 665061181. The next prime is 665061277. The reversal of 665061247 is 742160566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665061247 is a prime.

It is a super-2 number, since 2×665061247² = 884612924522390018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665061277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332530623 + 332530624.

It is an arithmetic number, because the mean of its divisors is an integer number (332530624).

Almost surely, 2^665061247 is an apocalyptic number.

665061247 is a deficient number, since it is larger than the sum of its proper divisors (1).

665061247 is an equidigital number, since it uses as much as digits as its factorization.

665061247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 665061247 is about 25788.7814175079. The cubic root of 665061247 is about 872.8786694673.

The spelling of 665061247 in words is "six hundred sixty-five million, sixty-one thousand, two hundred forty-seven".