64743517 has 2 divisors, whose sum is σ = 64743518. Its totient is φ = 64743516.

The previous prime is 64743491. The next prime is 64743521. The reversal of 64743517 is 71534746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39803481 + 24940036 = 6309^2 + 4994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64743517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64743557) 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, 32371758 + 32371759.

It is an arithmetic number, because the mean of its divisors is an integer number (32371759).

Almost surely, 2^64743517 is an apocalyptic number.

It is an amenable number.

64743517 is a deficient number, since it is larger than the sum of its proper divisors (1).

64743517 is an equidigital number, since it uses as much as digits as its factorization.

64743517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 37.

The square root of 64743517 is about 8046.3356256124. The cubic root of 64743517 is about 401.5430337135.

The spelling of 64743517 in words is "sixty-four million, seven hundred forty-three thousand, five hundred seventeen".