3864643226646 has 16 divisors (see below), whose sum is σ = 7729340588544. Its totient is φ = 1288205386344.

The previous prime is 3864643226641. The next prime is 3864643226699. The reversal of 3864643226646 is 6466223464683.

It is a super-2 number, since 2×3864643226646² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3864643226646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3864643226641) 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 7 ways as a sum of consecutive naturals, for example, 1296190 + ... + 3067473.

It is an arithmetic number, because the mean of its divisors is an integer number (483083786784).

Almost surely, 2^{3864643226646} is an apocalyptic number.

3864643226646 is an abundant number, since it is smaller than the sum of its proper divisors (3864697361898).

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

3864643226646 is a wasteful number, since it uses less digits than its factorization.

3864643226646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511275.

The product of its digits is 143327232, while the sum is 60.

The spelling of 3864643226646 in words is "three trillion, eight hundred sixty-four billion, six hundred forty-three million, two hundred twenty-six thousand, six hundred forty-six".