64591008767 has 4 divisors (see below), whose sum is σ = 67399313520. Its totient is φ = 61782704016.

The previous prime is 64591008739. The next prime is 64591008791. The reversal of 64591008767 is 76780019546.

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 64591008767 - 2¹⁰ = 64591007743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64591008467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1404152342 + ... + 1404152387.

It is an arithmetic number, because the mean of its divisors is an integer number (16849828380).

Almost surely, 2^64591008767 is an apocalyptic number.

64591008767 is a deficient number, since it is larger than the sum of its proper divisors (2808304753).

64591008767 is a wasteful number, since it uses less digits than its factorization.

64591008767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808304752.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 64591008767 in words is "sixty-four billion, five hundred ninety-one million, eight thousand, seven hundred sixty-seven".