64319440767997 has 2 divisors, whose sum is σ = 64319440767998. Its totient is φ = 64319440767996.

The previous prime is 64319440767979. The next prime is 64319440768001. The reversal of 64319440767997 is 79976704491346.

Together with previous prime (64319440767979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45086470905316 + 19232969862681 = 6714646^2 + 4385541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64319440767997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64319440767697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32159720383998 + 32159720383999.

It is an arithmetic number, because the mean of its divisors is an integer number (32159720383999).

Almost surely, 2^{64319440767997} is an apocalyptic number.

It is an amenable number.

64319440767997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64319440767997 is an equidigital number, since it uses as much as digits as its factorization.

64319440767997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728324864, while the sum is 76.

The spelling of 64319440767997 in words is "sixty-four trillion, three hundred nineteen billion, four hundred forty million, seven hundred sixty-seven thousand, nine hundred ninety-seven".