663240511 has 2 divisors, whose sum is σ = 663240512. Its totient is φ = 663240510.

The previous prime is 663240439. The next prime is 663240517. The reversal of 663240511 is 115042366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663240511 - 2¹¹ = 663238463 is a prime.

It is a super-2 number, since 2×663240511² = 879775950863082242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 663240511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663240517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331620255 + 331620256.

It is an arithmetic number, because the mean of its divisors is an integer number (331620256).

Almost surely, 2^663240511 is an apocalyptic number.

663240511 is a deficient number, since it is larger than the sum of its proper divisors (1).

663240511 is an equidigital number, since it uses as much as digits as its factorization.

663240511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 663240511 is about 25753.4562923115. The cubic root of 663240511 is about 872.0813824214.

Adding to 663240511 its reverse (115042366), we get a palindrome (778282877).

The spelling of 663240511 in words is "six hundred sixty-three million, two hundred forty thousand, five hundred eleven".