64221404643 has 48 divisors (see below), whose sum is σ = 106467615072. Its totient is φ = 36946368000.

The previous prime is 64221404641. The next prime is 64221404647. The reversal of 64221404643 is 34640412246.

64221404643 is a `hidden beast` number, since 6 + 4 + 2 + 2 + 1 + 4 + 0 + 4 + 643 = 666.

It is not a de Polignac number, because 64221404643 - 2¹ = 64221404641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64221404598 and 64221404607.

It is not an unprimeable number, because it can be changed into a prime (64221404641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63628 + ... + 363993.

It is an arithmetic number, because the mean of its divisors is an integer number (2218075314).

Almost surely, 2^64221404643 is an apocalyptic number.

64221404643 is a deficient number, since it is larger than the sum of its proper divisors (42246210429).

64221404643 is a wasteful number, since it uses less digits than its factorization.

64221404643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427716 (or 427713 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

Adding to 64221404643 its reverse (34640412246), we get a palindrome (98861816889).

It can be divided in two parts, 64221 and 404643, that added together give a palindrome (468864).

The spelling of 64221404643 in words is "sixty-four billion, two hundred twenty-one million, four hundred four thousand, six hundred forty-three".