64642864569 has 8 divisors (see below), whose sum is σ = 87158918880. Its totient is φ = 42611026656.

The previous prime is 64642864549. The next prime is 64642864597. The reversal of 64642864569 is 96546824646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64642864569 - 2⁵ = 64642864537 is a prime.

It is a super-2 number, since 2×64642864569² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64642864529) 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 7 ways as a sum of consecutive naturals, for example, 121053787 + ... + 121054320.

It is an arithmetic number, because the mean of its divisors is an integer number (10894864860).

Almost surely, 2^64642864569 is an apocalyptic number.

It is an amenable number.

64642864569 is a deficient number, since it is larger than the sum of its proper divisors (22516054311).

64642864569 is a wasteful number, since it uses less digits than its factorization.

64642864569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242108199.

The product of its digits is 59719680, while the sum is 60.

The spelling of 64642864569 in words is "sixty-four billion, six hundred forty-two million, eight hundred sixty-four thousand, five hundred sixty-nine".