64437111317 has 2 divisors, whose sum is σ = 64437111318. Its totient is φ = 64437111316.

The previous prime is 64437111247. The next prime is 64437111371. The reversal of 64437111317 is 71311173446.

It is a happy number.

Together with next prime (64437111371) 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., 62727206116 + 1709905201 = 250454^2 + 41351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64437111317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64437111217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32218555658 + 32218555659.

It is an arithmetic number, because the mean of its divisors is an integer number (32218555659).

Almost surely, 2^64437111317 is an apocalyptic number.

It is an amenable number.

64437111317 is a deficient number, since it is larger than the sum of its proper divisors (1).

64437111317 is an equidigital number, since it uses as much as digits as its factorization.

64437111317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The spelling of 64437111317 in words is "sixty-four billion, four hundred thirty-seven million, one hundred eleven thousand, three hundred seventeen".