64684500548646 has 64 divisors (see below), whose sum is σ = 145781967165696. Its totient is φ = 18961356643200.

The previous prime is 64684500548641. The next prime is 64684500548711.

It is a happy number.

64684500548646 is nontrivially palindromic in base 10.

64684500548646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64684500548646² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64684500548641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76133400 + ... + 76978331.

It is an arithmetic number, because the mean of its divisors is an integer number (2277843236964).

Almost surely, 2^{64684500548646} is an apocalyptic number.

64684500548646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64684500548646 is an abundant number, since it is smaller than the sum of its proper divisors (81097466617050).

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

64684500548646 is a wasteful number, since it uses less digits than its factorization.

64684500548646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153111957.

The product of its (nonzero) digits is 530841600, while the sum is 66.

The spelling of 64684500548646 in words is "sixty-four trillion, six hundred eighty-four billion, five hundred million, five hundred forty-eight thousand, six hundred forty-six".