1630144666 has 8 divisors (see below), whose sum is σ = 2504856564. Its totient is φ = 795192480.

The previous prime is 1630144661. The next prime is 1630144669. The reversal of 1630144666 is 6664410361.

It can be written as a sum of positive squares in 2 ways, for example, as 1621270225 + 8874441 = 40265^2 + 2979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1630144661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9939825 + ... + 9939988.

Almost surely, 2^1630144666 is an apocalyptic number.

1630144666 is a deficient number, since it is larger than the sum of its proper divisors (874711898).

1630144666 is a wasteful number, since it uses less digits than its factorization.

1630144666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19879856.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 1630144666 is about 40375.0500433126. The cubic root of 1630144666 is about 1176.9067375063.

The spelling of 1630144666 in words is "one billion, six hundred thirty million, one hundred forty-four thousand, six hundred sixty-six".