1648566664 has 8 divisors (see below), whose sum is σ = 3091062510. Its totient is φ = 824283328.

The previous prime is 1648566641. The next prime is 1648566671. The reversal of 1648566664 is 4666658461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1000456900 + 648109764 = 31630^2 + 25458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103035409 + ... + 103035424.

Almost surely, 2^1648566664 is an apocalyptic number.

It is an amenable number.

1648566664 is a deficient number, since it is larger than the sum of its proper divisors (1442495846).

1648566664 is a wasteful number, since it uses less digits than its factorization.

1648566664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206070839 (or 206070835 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 52.

The square root of 1648566664 is about 40602.5450433837. The cubic root of 1648566664 is about 1181.3234848642.

The spelling of 1648566664 in words is "one billion, six hundred forty-eight million, five hundred sixty-six thousand, six hundred sixty-four".