664620511 has 2 divisors, whose sum is σ = 664620512. Its totient is φ = 664620510.

The previous prime is 664620497. The next prime is 664620571. The reversal of 664620511 is 115026466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664620511 - 2¹⁷ = 664489439 is a prime.

It is a super-2 number, since 2×664620511² = 883440847283802242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664620571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332310255 + 332310256.

It is an arithmetic number, because the mean of its divisors is an integer number (332310256).

Almost surely, 2^664620511 is an apocalyptic number.

664620511 is a deficient number, since it is larger than the sum of its proper divisors (1).

664620511 is an equidigital number, since it uses as much as digits as its factorization.

664620511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 664620511 is about 25780.2348903186. The cubic root of 664620511 is about 872.6858079985.

Adding to 664620511 its reverse (115026466), we get a palindrome (779646977).

The spelling of 664620511 in words is "six hundred sixty-four million, six hundred twenty thousand, five hundred eleven".