64664246646 has 64 divisors (see below), whose sum is σ = 145722628800. Its totient is φ = 21252768768.

The previous prime is 64664246639. The next prime is 64664246651.

64664246646 is a `hidden beast` number, since 64 + 66 + 424 + 66 + 46 = 666.

64664246646 is nontrivially palindromic in base 10.

64664246646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 64664246592 and 64664246601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1386076 + ... + 1431968.

It is an arithmetic number, because the mean of its divisors is an integer number (2276916075).

Almost surely, 2^64664246646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64664246646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72861314400).

64664246646 is an abundant number, since it is smaller than the sum of its proper divisors (81058382154).

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

64664246646 is a wasteful number, since it uses less digits than its factorization.

64664246646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46270 (or 46264 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 54.

The spelling of 64664246646 in words is "sixty-four billion, six hundred sixty-four million, two hundred forty-six thousand, six hundred forty-six".