665614387 has 2 divisors, whose sum is σ = 665614388. Its totient is φ = 665614386.

The previous prime is 665614343. The next prime is 665614451. The reversal of 665614387 is 783416566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665614387 - 2⁷ = 665614259 is a prime.

It is not a weakly prime, because it can be changed into another prime (665614307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332807193 + 332807194.

It is an arithmetic number, because the mean of its divisors is an integer number (332807194).

Almost surely, 2^665614387 is an apocalyptic number.

665614387 is a deficient number, since it is larger than the sum of its proper divisors (1).

665614387 is an equidigital number, since it uses as much as digits as its factorization.

665614387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 46.

The square root of 665614387 is about 25799.5036192559. The cubic root of 665614387 is about 873.1205972166.

The spelling of 665614387 in words is "six hundred sixty-five million, six hundred fourteen thousand, three hundred eighty-seven".