1066640644 has 6 divisors (see below), whose sum is σ = 1866621134. Its totient is φ = 533320320.

The previous prime is 1066640629. The next prime is 1066640651. The reversal of 1066640644 is 4460466601.

It is a happy number.

1066640644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 954068544 + 112572100 = 30888^2 + 10610^2 .

It is a super-2 number, since 2×1066640644² = 2275444526865469472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133330077 + ... + 133330084.

Almost surely, 2^1066640644 is an apocalyptic number.

It is an amenable number.

1066640644 is a deficient number, since it is larger than the sum of its proper divisors (799980490).

1066640644 is a wasteful number, since it uses less digits than its factorization.

1066640644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266660165 (or 266660163 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 1066640644 is about 32659.4648455850. The cubic root of 1066640644 is about 1021.7376008676.

The spelling of 1066640644 in words is "one billion, sixty-six million, six hundred forty thousand, six hundred forty-four".