64722778864 has 10 divisors (see below), whose sum is σ = 125400384080. Its totient is φ = 32361389424.

The previous prime is 64722778853. The next prime is 64722778889. The reversal of 64722778864 is 46887722746.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2022586824 + ... + 2022586855.

It is an arithmetic number, because the mean of its divisors is an integer number (12540038408).

Almost surely, 2^64722778864 is an apocalyptic number.

It is an amenable number.

64722778864 is a deficient number, since it is larger than the sum of its proper divisors (60677605216).

64722778864 is a wasteful number, since it uses less digits than its factorization.

64722778864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045173687 (or 4045173681 counting only the distinct ones).

The product of its digits is 50577408, while the sum is 61.

The spelling of 64722778864 in words is "sixty-four billion, seven hundred twenty-two million, seven hundred seventy-eight thousand, eight hundred sixty-four".