664938835247 has 2 divisors, whose sum is σ = 664938835248. Its totient is φ = 664938835246.

The previous prime is 664938835139. The next prime is 664938835259. The reversal of 664938835247 is 742538839466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664938835247 - 2³⁸ = 390060928303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664938835747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332469417623 + 332469417624.

It is an arithmetic number, because the mean of its divisors is an integer number (332469417624).

Almost surely, 2^664938835247 is an apocalyptic number.

664938835247 is a deficient number, since it is larger than the sum of its proper divisors (1).

664938835247 is an equidigital number, since it uses as much as digits as its factorization.

664938835247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209018880, while the sum is 65.

The spelling of 664938835247 in words is "six hundred sixty-four billion, nine hundred thirty-eight million, eight hundred thirty-five thousand, two hundred forty-seven".