664444226666 has 64 divisors (see below), whose sum is σ = 1136891448576. Its totient is φ = 288630950400.

The previous prime is 664444226557. The next prime is 664444226669. The reversal of 664444226666 is 666622444466.

It is a super-2 number, since 2×664444226666² (a number of 24 digits) contains 22 as substring.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (664444226669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7280630 + ... + 7371326.

It is an arithmetic number, because the mean of its divisors is an integer number (17763928884).

It is a self-describing number.

Almost surely, 2^664444226666 is an apocalyptic number.

664444226666 is a deficient number, since it is larger than the sum of its proper divisors (472447221910).

664444226666 is a wasteful number, since it uses less digits than its factorization.

664444226666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90927.

The product of its digits is 47775744, while the sum is 56.

The spelling of 664444226666 in words is "six hundred sixty-four billion, four hundred forty-four million, two hundred twenty-six thousand, six hundred sixty-six".