64717343649 has 12 divisors (see below), whose sum is σ = 106834980096. Its totient is φ = 36981339192.

The previous prime is 64717343623. The next prime is 64717343653. The reversal of 64717343649 is 94634371746.

64717343649 is a `hidden beast` number, since 6 + 471 + 73 + 43 + 64 + 9 = 666.

It is not a de Polignac number, because 64717343649 - 2¹² = 64717339553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64717343595 and 64717343604.

It is not an unprimeable number, because it can be changed into a prime (64717343659) 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 in 11 ways as a sum of consecutive naturals, for example, 513629649 + ... + 513629774.

It is an arithmetic number, because the mean of its divisors is an integer number (8902915008).

Almost surely, 2^64717343649 is an apocalyptic number.

It is an amenable number.

64717343649 is a deficient number, since it is larger than the sum of its proper divisors (42117636447).

64717343649 is a wasteful number, since it uses less digits than its factorization.

64717343649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027259436 (or 1027259433 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 54.

The spelling of 64717343649 in words is "sixty-four billion, seven hundred seventeen million, three hundred forty-three thousand, six hundred forty-nine".