64619669808 has 80 divisors (see below), whose sum is σ = 185516643040. Its totient is φ = 21535911936.

The previous prime is 64619669771. The next prime is 64619669827. The reversal of 64619669808 is 80896691646.

64619669808 is a `hidden beast` number, since 6 + 4 + 619 + 6 + 6 + 9 + 8 + 0 + 8 = 666.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3183660 + ... + 3203892.

It is an arithmetic number, because the mean of its divisors is an integer number (2318958038).

Almost surely, 2^64619669808 is an apocalyptic number.

It is an amenable number.

64619669808 is an abundant number, since it is smaller than the sum of its proper divisors (120896973232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64619669808 is a wasteful number, since it uses less digits than its factorization.

64619669808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27643 (or 27631 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 63.

The spelling of 64619669808 in words is "sixty-four billion, six hundred nineteen million, six hundred sixty-nine thousand, eight hundred eight".