663710857 has 2 divisors, whose sum is σ = 663710858. Its totient is φ = 663710856.

The previous prime is 663710833. The next prime is 663710903. The reversal of 663710857 is 758017366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384787456 + 278923401 = 19616^2 + 16701^2 .

It is a cyclic number.

It is not a de Polignac number, because 663710857 - 2¹¹ = 663708809 is a prime.

It is not a weakly prime, because it can be changed into another prime (663710557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331855428 + 331855429.

It is an arithmetic number, because the mean of its divisors is an integer number (331855429).

Almost surely, 2^663710857 is an apocalyptic number.

It is an amenable number.

663710857 is a deficient number, since it is larger than the sum of its proper divisors (1).

663710857 is an equidigital number, since it uses as much as digits as its factorization.

663710857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 663710857 is about 25762.5863802531. The cubic root of 663710857 is about 872.2874831545.

The spelling of 663710857 in words is "six hundred sixty-three million, seven hundred ten thousand, eight hundred fifty-seven".