665384749 has 2 divisors, whose sum is σ = 665384750. Its totient is φ = 665384748.

The previous prime is 665384701. The next prime is 665384773. The reversal of 665384749 is 947483566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661004100 + 4380649 = 25710^2 + 2093^2 .

It is a cyclic number.

It is not a de Polignac number, because 665384749 - 2¹³ = 665376557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665384696 and 665384705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665382749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332692374 + 332692375.

It is an arithmetic number, because the mean of its divisors is an integer number (332692375).

Almost surely, 2^665384749 is an apocalyptic number.

It is an amenable number.

665384749 is a deficient number, since it is larger than the sum of its proper divisors (1).

665384749 is an equidigital number, since it uses as much as digits as its factorization.

665384749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 52.

The square root of 665384749 is about 25795.0528008764. The cubic root of 665384749 is about 873.0201763454.

The spelling of 665384749 in words is "six hundred sixty-five million, three hundred eighty-four thousand, seven hundred forty-nine".