664727263 has 2 divisors, whose sum is σ = 664727264. Its totient is φ = 664727262.

The previous prime is 664727257. The next prime is 664727267. The reversal of 664727263 is 362727466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664727263 - 2¹³ = 664719071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664727267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332363631 + 332363632.

It is an arithmetic number, because the mean of its divisors is an integer number (332363632).

Almost surely, 2^664727263 is an apocalyptic number.

664727263 is a deficient number, since it is larger than the sum of its proper divisors (1).

664727263 is an equidigital number, since it uses as much as digits as its factorization.

664727263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 43.

The square root of 664727263 is about 25782.3052305258. The cubic root of 664727263 is about 872.7325293813.

The spelling of 664727263 in words is "six hundred sixty-four million, seven hundred twenty-seven thousand, two hundred sixty-three".