64684891850 has 24 divisors (see below), whose sum is σ = 120355109280. Its totient is φ = 25865094320.

The previous prime is 64684891811. The next prime is 64684891861. The reversal of 64684891850 is 5819848646.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64684891850.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 73142 + ... + 367041.

It is an arithmetic number, because the mean of its divisors is an integer number (5014796220).

Almost surely, 2^64684891850 is an apocalyptic number.

64684891850 is a deficient number, since it is larger than the sum of its proper divisors (55670217430).

64684891850 is a wasteful number, since it uses less digits than its factorization.

64684891850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443134 (or 443129 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 59.

The spelling of 64684891850 in words is "sixty-four billion, six hundred eighty-four million, eight hundred ninety-one thousand, eight hundred fifty".