663576857 has 2 divisors, whose sum is σ = 663576858. Its totient is φ = 663576856.

The previous prime is 663576847. The next prime is 663576931. The reversal of 663576857 is 758675366.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481758601 + 181818256 = 21949^2 + 13484^2 .

It is a cyclic number.

It is not a de Polignac number, because 663576857 - 2¹⁰ = 663575833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 663576799 and 663576808.

It is not a weakly prime, because it can be changed into another prime (663576847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331788428 + 331788429.

It is an arithmetic number, because the mean of its divisors is an integer number (331788429).

Almost surely, 2^663576857 is an apocalyptic number.

It is an amenable number.

663576857 is a deficient number, since it is larger than the sum of its proper divisors (1).

663576857 is an equidigital number, since it uses as much as digits as its factorization.

663576857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 53.

The square root of 663576857 is about 25759.9855784121. The cubic root of 663576857 is about 872.2287756673.

The spelling of 663576857 in words is "six hundred sixty-three million, five hundred seventy-six thousand, eight hundred fifty-seven".