663170749 has 2 divisors, whose sum is σ = 663170750. Its totient is φ = 663170748.

The previous prime is 663170741. The next prime is 663170779. The reversal of 663170749 is 947071366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 654438724 + 8732025 = 25582^2 + 2955^2 .

It is a cyclic number.

It is not a de Polignac number, because 663170749 - 2³ = 663170741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663170741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331585374 + 331585375.

It is an arithmetic number, because the mean of its divisors is an integer number (331585375).

Almost surely, 2^663170749 is an apocalyptic number.

It is an amenable number.

663170749 is a deficient number, since it is larger than the sum of its proper divisors (1).

663170749 is an equidigital number, since it uses as much as digits as its factorization.

663170749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 663170749 is about 25752.1018365492. The cubic root of 663170749 is about 872.0508051404.

The spelling of 663170749 in words is "six hundred sixty-three million, one hundred seventy thousand, seven hundred forty-nine".