4644631666 has 4 divisors (see below), whose sum is σ = 6966947502. Its totient is φ = 2322315832.

The previous prime is 4644631639. The next prime is 4644631669. The reversal of 4644631666 is 6661364464.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4050686025 + 593945641 = 63645^2 + 24371^2 .

It is not an unprimeable number, because it can be changed into a prime (4644631669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1161157915 + ... + 1161157918.

Almost surely, 2^4644631666 is an apocalyptic number.

4644631666 is a deficient number, since it is larger than the sum of its proper divisors (2322315836).

4644631666 is a wasteful number, since it uses less digits than its factorization.

4644631666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322315835.

The product of its digits is 1492992, while the sum is 46.

The square root of 4644631666 is about 68151.5345828691. The cubic root of 4644631666 is about 1668.4649699963.

The spelling of 4644631666 in words is "four billion, six hundred forty-four million, six hundred thirty-one thousand, six hundred sixty-six".