64852778109 has 32 divisors (see below), whose sum is σ = 104177249280. Its totient is φ = 35056720512.

The previous prime is 64852778099. The next prime is 64852778141. The reversal of 64852778109 is 90187725846.

It is not a de Polignac number, because 64852778109 - 2⁸ = 64852777853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64852777109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153529 + ... + 391505.

It is an arithmetic number, because the mean of its divisors is an integer number (3255539040).

Almost surely, 2^64852778109 is an apocalyptic number.

It is an amenable number.

64852778109 is a deficient number, since it is larger than the sum of its proper divisors (39324471171).

64852778109 is a wasteful number, since it uses less digits than its factorization.

64852778109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238689.

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 64852778109 in words is "sixty-four billion, eight hundred fifty-two million, seven hundred seventy-eight thousand, one hundred nine".