664201511 has 2 divisors, whose sum is σ = 664201512. Its totient is φ = 664201510.

The previous prime is 664201477. The next prime is 664201513. The reversal of 664201511 is 115102466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664201511 - 2²² = 660007207 is a prime.

Together with 664201513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664201513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332100755 + 332100756.

It is an arithmetic number, because the mean of its divisors is an integer number (332100756).

Almost surely, 2^664201511 is an apocalyptic number.

664201511 is a deficient number, since it is larger than the sum of its proper divisors (1).

664201511 is an equidigital number, since it uses as much as digits as its factorization.

664201511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 664201511 is about 25772.1072285523. The cubic root of 664201511 is about 872.5023789012.

Adding to 664201511 its reverse (115102466), we get a palindrome (779303977).

The spelling of 664201511 in words is "six hundred sixty-four million, two hundred one thousand, five hundred eleven".