64640244204646 has 128 divisors (see below), whose sum is σ = 116521207603200. Its totient is φ = 26547873327360.

The previous prime is 64640244204643. The next prime is 64640244204673.

64640244204646 is nontrivially palindromic in base 10.

64640244204646 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 2×64640244204646² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64640244204593 and 64640244204602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640244204643) 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 63 ways as a sum of consecutive naturals, for example, 5515843975 + ... + 5515855693.

It is an arithmetic number, because the mean of its divisors is an integer number (910321934400).

Almost surely, 2^{64640244204646} is an apocalyptic number.

64640244204646 is a deficient number, since it is larger than the sum of its proper divisors (51880963398554).

64640244204646 is a wasteful number, since it uses less digits than its factorization.

64640244204646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13394.

The product of its (nonzero) digits is 21233664, while the sum is 52.

The spelling of 64640244204646 in words is "sixty-four trillion, six hundred forty billion, two hundred forty-four million, two hundred four thousand, six hundred forty-six".