64717764707 has 4 divisors (see below), whose sum is σ = 64768208520. Its totient is φ = 64667320896.

The previous prime is 64717764703. The next prime is 64717764719. The reversal of 64717764707 is 70746771746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64717764707 - 2² = 64717764703 is a prime.

It is a super-2 number, since 2×64717764707² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64717764703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25219982 + ... + 25222547.

It is an arithmetic number, because the mean of its divisors is an integer number (16192052130).

Almost surely, 2^64717764707 is an apocalyptic number.

64717764707 is a deficient number, since it is larger than the sum of its proper divisors (50443813).

64717764707 is a wasteful number, since it uses less digits than its factorization.

64717764707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50443812.

The product of its (nonzero) digits is 9680832, while the sum is 56.

The spelling of 64717764707 in words is "sixty-four billion, seven hundred seventeen million, seven hundred sixty-four thousand, seven hundred seven".